diff --git a/meson.build b/meson.build
index e556b3c6..7ebd1ed4 100644
--- a/meson.build
+++ b/meson.build
@@ -160,6 +160,7 @@ gdk_pixbuf_dep = disabler()
 omemo_dep = disabler()
 gcrypt_dep = disabler()
 qrencode_dep = disabler()
+enchant_dep = disabler()
 
 # Dependencies for functional tests
 stabber_dep = cc.find_library('stabber', required: false)
@@ -269,6 +270,12 @@ if get_option('omemo-qrcode').enabled()
   conf_data.set('HAVE_QRENCODE', 1)
 endif
 
+# Spellcheck support
+if get_option('spellcheck').enabled()
+  enchant_dep = dependency('enchant-2', required: true)
+  conf_data.set('HAVE_SPELLCHECK', 1)
+endif
+
 # Set installation paths
 themes_path = get_option('themes_path')
 if themes_path == ''
@@ -355,6 +362,10 @@ if qrencode_dep.found()
   profanity_deps += qrencode_dep
 endif
 
+if enchant_dep.found()
+  profanity_deps += enchant_dep
+endif
+
 # Include directories
 inc = include_directories('.', 'src')
 
@@ -419,6 +430,7 @@ core_sources = files(
   'src/tools/autocomplete.c',
   'src/tools/clipboard.c',
   'src/tools/editor.c',
+  'src/tools/spellcheck.c',
   'src/config/files.c',
   'src/config/conflists.c',
   'src/config/accounts.c',
@@ -584,6 +596,7 @@ if get_option('tests')
       'src/tools/autocomplete.c',
       'src/tools/clipboard.c',
       'src/tools/editor.c',
+      'src/tools/spellcheck.c',
       'src/tools/bookmark_ignore.c',
       'src/config/account.c',
       'src/config/files.c',
diff --git a/meson_options.txt b/meson_options.txt
index 363c6360..03018334 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -66,6 +66,12 @@ option('omemo-qrcode',
   description: 'Enable ability to display OMEMO QR code'
 )
 
+option('spellcheck',
+  type: 'feature',
+  value: 'disabled',
+  description: 'Enable spellchecking support'
+)
+
 # Other:
 option('python_framework',
   type: 'string',
diff --git a/src/command/cmd_ac.c b/src/command/cmd_ac.c
index 9799134d..34e92446 100644
--- a/src/command/cmd_ac.c
+++ b/src/command/cmd_ac.c
@@ -43,6 +43,7 @@
 static char* _sub_autocomplete(ProfWin* window, const char* const input, gboolean previous);
 static char* _notify_autocomplete(ProfWin* window, const char* const input, gboolean previous);
 static char* _theme_autocomplete(ProfWin* window, const char* const input, gboolean previous);
+static char* _spellcheck_autocomplete(ProfWin* window, const char* const input, gboolean previous);
 static char* _autoaway_autocomplete(ProfWin* window, const char* const input, gboolean previous);
 static char* _autoconnect_autocomplete(ProfWin* window, const char* const input, gboolean previous);
 static char* _account_autocomplete(ProfWin* window, const char* const input, gboolean previous);
@@ -138,6 +139,7 @@ static Autocomplete autoconnect_ac;
 static Autocomplete wintitle_ac;
 static Autocomplete theme_ac;
 static Autocomplete theme_load_ac;
+static Autocomplete spellcheck_ac;
 static Autocomplete account_ac;
 static Autocomplete account_set_ac;
 static Autocomplete account_clear_ac;
@@ -298,6 +300,7 @@ static Autocomplete* all_acs[] = {
     &autoconnect_ac,
     &wintitle_ac,
     &theme_ac,
+    &spellcheck_ac,
     &account_ac,
     &account_set_ac,
     &account_clear_ac,
@@ -563,6 +566,10 @@ cmd_ac_init(void)
     autocomplete_add(theme_ac, "colours");
     autocomplete_add(theme_ac, "properties");
 
+    autocomplete_add(spellcheck_ac, "on");
+    autocomplete_add(spellcheck_ac, "off");
+    autocomplete_add(spellcheck_ac, "lang");
+
     autocomplete_add(disco_ac, "info");
     autocomplete_add(disco_ac, "items");
 
@@ -1748,6 +1755,16 @@ cmd_ac_complete_filepath(const char* const input, char* const startstr, gboolean
     return autocomplete_param_with_ac(input, startstr, filepath_ac, TRUE, previous);
 }
 
+static char*
+_spellcheck_autocomplete(ProfWin* window, const char* const input, gboolean previous)
+{
+    char* result = NULL;
+
+    result = autocomplete_param_with_ac(input, "/spellcheck", spellcheck_ac, TRUE, previous);
+
+    return result;
+}
+
 static char*
 _cmd_ac_complete_params(ProfWin* window, const char* const input, gboolean previous)
 {
@@ -1767,6 +1784,11 @@ _cmd_ac_complete_params(ProfWin* window, const char* const input, gboolean previ
         }
     }
 
+    result = _spellcheck_autocomplete(window, input, previous);
+    if (result) {
+        return result;
+    }
+
     // autocomplete nickname in chat rooms
     if (window->type == WIN_MUC) {
         ProfMucWin* mucwin = (ProfMucWin*)window;
diff --git a/src/command/cmd_defs.c b/src/command/cmd_defs.c
index 28b473fd..59f910f5 100644
--- a/src/command/cmd_defs.c
+++ b/src/command/cmd_defs.c
@@ -1451,6 +1451,22 @@ static const struct cmd_t command_defs[] = {
               { "on|off", "Enable or disable splash logo." })
     },
 
+    { CMD_PREAMBLE("/spellcheck",
+                   parse_args, 1, 2, &cons_spellcheck_setting)
+      CMD_MAINFUNC(cmd_spellcheck)
+      CMD_TAGS(
+              CMD_TAG_UI)
+      CMD_SYN(
+              "/spellcheck on|off",
+              "/spellcheck lang <locale>")
+      CMD_DESC(
+              "Enable or disable spellchecking, or set the language.")
+      CMD_ARGS(
+              { "on|off", "Enable or disable spellchecking." },
+              { "list", "List available dictionaries recognized by Enchant." },
+              { "lang <locale>", "Set the spellcheck language (en_US)." })
+    },
+
     { CMD_PREAMBLE("/autoconnect",
                    parse_args, 1, 2, &cons_autoconnect_setting)
       CMD_MAINFUNC(cmd_autoconnect)
diff --git a/src/command/cmd_funcs.c b/src/command/cmd_funcs.c
index 68d6188a..133f54c9 100644
--- a/src/command/cmd_funcs.c
+++ b/src/command/cmd_funcs.c
@@ -54,6 +54,7 @@
 #include "tools/plugin_download.h"
 #include "tools/bookmark_ignore.h"
 #include "tools/editor.h"
+#include "tools/spellcheck.h"
 #include "plugins/plugins.h"
 #include "ui/inputwin.h"
 #include "ui/ui.h"
@@ -6560,6 +6561,37 @@ cmd_splash(ProfWin* window, const char* const command, gchar** args)
     return TRUE;
 }
 
+gboolean
+cmd_spellcheck(ProfWin* window, const char* const command, gchar** args)
+{
+#ifdef HAVE_SPELLCHECK
+    if (g_strcmp0(args[0], "on") == 0) {
+        prefs_set_boolean(PREF_SPELLCHECK_ENABLE, TRUE);
+        cons_show("Spellcheck enabled.");
+    } else if (g_strcmp0(args[0], "off") == 0) {
+        prefs_set_boolean(PREF_SPELLCHECK_ENABLE, FALSE);
+        cons_show("Spellcheck disabled.");
+    } else if (g_strcmp0(args[0], "lang") == 0) {
+        if (args[1] == NULL) {
+            cons_bad_cmd_usage(command);
+        } else {
+            if (spellcheck_set_lang(args[1])) {
+                prefs_set_string(PREF_SPELLCHECK_LANG, args[1]);
+                cons_show("Spellcheck language set to: %s", args[1]);
+            } else {
+                cons_show("Failed to set spellcheck language to: %s. Is the dictionary installed?", args[1]);
+            }
+        }
+    } else {
+        cons_bad_cmd_usage(command);
+    }
+#else
+    cons_show("Profanity was built without spellcheck support.");
+#endif
+
+    return TRUE;
+}
+
 gboolean
 cmd_autoconnect(ProfWin* window, const char* const command, gchar** args)
 {
diff --git a/src/command/cmd_funcs.h b/src/command/cmd_funcs.h
index 72739187..10455dc0 100644
--- a/src/command/cmd_funcs.h
+++ b/src/command/cmd_funcs.h
@@ -103,6 +103,7 @@ gboolean cmd_bookmark_ignore(ProfWin* window, const char* const command, gchar**
 gboolean cmd_roster(ProfWin* window, const char* const command, gchar** args);
 gboolean cmd_software(ProfWin* window, const char* const command, gchar** args);
 gboolean cmd_splash(ProfWin* window, const char* const command, gchar** args);
+gboolean cmd_spellcheck(ProfWin* window, const char* const command, gchar** args);
 gboolean cmd_states(ProfWin* window, const char* const command, gchar** args);
 gboolean cmd_status_get(ProfWin* window, const char* const command, gchar** args);
 gboolean cmd_status_set(ProfWin* window, const char* const command, gchar** args);
diff --git a/src/config/preferences.c b/src/config/preferences.c
index 6cc58244..aa59fa59 100644
--- a/src/config/preferences.c
+++ b/src/config/preferences.c
@@ -41,6 +41,7 @@
 #define PREF_GROUP_MUC           "muc"
 #define PREF_GROUP_PLUGINS       "plugins"
 #define PREF_GROUP_EXECUTABLES   "executables"
+#define PREF_GROUP_SPELLCHECK    "spellcheck"
 
 #define INPBLOCK_DEFAULT 1000
 
@@ -1909,6 +1910,9 @@ _get_group(preference_t pref)
         return PREF_GROUP_OMEMO;
     case PREF_OX_LOG:
         return PREF_GROUP_OX;
+    case PREF_SPELLCHECK_ENABLE:
+    case PREF_SPELLCHECK_LANG:
+        return PREF_GROUP_SPELLCHECK;
     default:
         return NULL;
     }
@@ -2196,6 +2200,10 @@ _get_key(preference_t pref)
         return "strophe.sm.enabled";
     case PREF_STROPHE_SM_RESEND:
         return "strophe.sm.resend";
+    case PREF_SPELLCHECK_ENABLE:
+        return "enabled";
+    case PREF_SPELLCHECK_LANG:
+        return "lang";
     default:
         return NULL;
     }
@@ -2249,6 +2257,7 @@ _get_default_boolean(preference_t pref)
     case PREF_STROPHE_SM_ENABLED:
     case PREF_STROPHE_SM_RESEND:
         return TRUE;
+    case PREF_SPELLCHECK_ENABLE:
     case PREF_PGP_PUBKEY_AUTOIMPORT:
     default:
         return FALSE;
@@ -2356,6 +2365,8 @@ _get_default_string(preference_t pref)
         return "0";
     case PREF_DBLOG:
         return "on";
+    case PREF_SPELLCHECK_LANG:
+        return "en_US";
     default:
         return NULL;
     }
diff --git a/src/config/preferences.h b/src/config/preferences.h
index 1568a3d3..1708e442 100644
--- a/src/config/preferences.h
+++ b/src/config/preferences.h
@@ -161,6 +161,8 @@ typedef enum {
     PREF_STROPHE_SM_RESEND,
     PREF_VCARD_PHOTO_CMD,
     PREF_STATUSBAR_TABMODE,
+    PREF_SPELLCHECK_ENABLE,
+    PREF_SPELLCHECK_LANG,
 } preference_t;
 
 typedef struct prof_alias_t
diff --git a/src/config/theme.c b/src/config/theme.c
index c1fb6273..92a2ef27 100644
--- a/src/config/theme.c
+++ b/src/config/theme.c
@@ -90,6 +90,7 @@ theme_init(const char* const theme_name)
     g_hash_table_insert(defaults, strdup("mention"), strdup("yellow"));
     g_hash_table_insert(defaults, strdup("trigger"), strdup("yellow"));
     g_hash_table_insert(defaults, strdup("input.text"), strdup("default"));
+    g_hash_table_insert(defaults, strdup("input.misspelled"), strdup("red"));
     g_hash_table_insert(defaults, strdup("main.time"), strdup("default"));
     g_hash_table_insert(defaults, strdup("titlebar.text"), strdup("white"));
     g_hash_table_insert(defaults, strdup("titlebar.brackets"), strdup("cyan"));
@@ -713,6 +714,9 @@ theme_attrs(theme_item_t attrs)
     case THEME_INPUT_TEXT:
         _theme_prep_fgnd("input.text", lookup_str, &bold);
         break;
+    case THEME_INPUT_MISSPELLED:
+        _theme_prep_fgnd("input.misspelled", lookup_str, &bold);
+        break;
     case THEME_TIME:
         _theme_prep_fgnd("main.time", lookup_str, &bold);
         break;
diff --git a/src/config/theme.h b/src/config/theme.h
index 09923049..1d459ed7 100644
--- a/src/config/theme.h
+++ b/src/config/theme.h
@@ -27,6 +27,7 @@ typedef enum {
     THEME_MENTION,
     THEME_TRIGGER,
     THEME_INPUT_TEXT,
+    THEME_INPUT_MISSPELLED,
     THEME_TIME,
     THEME_TITLE_TEXT,
     THEME_TITLE_BRACKET,
diff --git a/src/profanity.c b/src/profanity.c
index 1c4e0220..ec6d3067 100644
--- a/src/profanity.c
+++ b/src/profanity.c
@@ -30,6 +30,7 @@
 #include "config/accounts.h"
 #include "config/preferences.h"
 #include "config/theme.h"
+#include "tools/spellcheck.h"
 #include "config/tlscerts.h"
 #include "config/scripts.h"
 #include "command/cmd_defs.h"
@@ -234,6 +235,7 @@ _init(char* log_level, char* config_file, char* log_file, char* theme_name)
 #ifdef HAVE_OMEMO
     omemo_init();
 #endif
+    spellcheck_init();
     atexit(_shutdown);
     plugins_init();
 #ifdef HAVE_GTK
diff --git a/src/tools/spellcheck.c b/src/tools/spellcheck.c
new file mode 100644
index 00000000..c23fa4e2
--- /dev/null
+++ b/src/tools/spellcheck.c
@@ -0,0 +1,107 @@
+/*
+ * spellcheck.c
+ * vim: expandtab:ts=4:sts=4:sw=4
+ *
+ * Copyright (C) 2026 Michael Vetter <jubalh@iodoru.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later WITH OpenSSL-exception
+ */
+
+#include "config.h"
+
+#ifdef HAVE_SPELLCHECK
+
+#include <enchant.h>
+#include <string.h>
+#include <glib.h>
+
+#include "tools/spellcheck.h"
+#include "config/preferences.h"
+#include "log.h"
+#include "common.h"
+
+static EnchantBroker* broker = NULL;
+static EnchantDict* dict = NULL;
+static char* current_lang = NULL;
+
+void
+spellcheck_init(void)
+{
+    if (broker) {
+        return;
+    }
+
+    broker = enchant_broker_init();
+    if (!broker) {
+        log_error("Failed to initialize Enchant broker");
+        return;
+    }
+
+    prof_add_shutdown_routine(spellcheck_deinit);
+
+    char* lang = prefs_get_string(PREF_SPELLCHECK_LANG);
+    spellcheck_set_lang(lang);
+    g_free(lang);
+}
+
+void
+spellcheck_deinit(void)
+{
+    if (dict) {
+        enchant_broker_free_dict(broker, dict);
+        dict = NULL;
+    }
+    if (broker) {
+        enchant_broker_free(broker);
+        broker = NULL;
+    }
+    g_free(current_lang);
+    current_lang = NULL;
+}
+
+gboolean
+spellcheck_set_lang(const char* lang)
+{
+    if (!broker || !lang) {
+        return FALSE;
+    }
+
+    if (current_lang && strcmp(current_lang, lang) == 0 && dict) {
+        return TRUE;
+    }
+
+    EnchantDict* new_dict = enchant_broker_request_dict(broker, lang);
+    if (!new_dict) {
+        log_error("Failed to request Enchant dictionary for language: %s", lang);
+        return FALSE;
+    }
+
+    if (dict) {
+        enchant_broker_free_dict(broker, dict);
+    }
+
+    dict = new_dict;
+    g_free(current_lang);
+    current_lang = g_strdup(lang);
+
+    return TRUE;
+}
+
+const char*
+spellcheck_get_lang(void)
+{
+    return current_lang;
+}
+
+gboolean
+spellcheck_is_misspelled(const char* word)
+{
+    if (!dict || !word || word[0] == '\0') {
+        return FALSE;
+    }
+
+    int result = enchant_dict_check(dict, word, strlen(word));
+    return (result != 0);
+}
+
+#endif
diff --git a/src/tools/spellcheck.h b/src/tools/spellcheck.h
new file mode 100644
index 00000000..d983106e
--- /dev/null
+++ b/src/tools/spellcheck.h
@@ -0,0 +1,52 @@
+/*
+ * spellcheck.h
+ * vim: expandtab:ts=4:sts=4:sw=4
+ *
+ * Copyright (C) 2026 Michael Vetter <jubalh@iodoru.org>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later WITH OpenSSL-exception
+ */
+
+#ifndef TOOLS_SPELLCHECK_H
+#define TOOLS_SPELLCHECK_H
+
+#include "config.h"
+#include <glib.h>
+
+#ifdef HAVE_SPELLCHECK
+
+void spellcheck_init(void);
+void spellcheck_deinit(void);
+gboolean spellcheck_is_misspelled(const char* word);
+gboolean spellcheck_set_lang(const char* lang);
+const char* spellcheck_get_lang(void);
+
+#else
+
+static inline void
+spellcheck_init(void)
+{
+}
+static inline void
+spellcheck_deinit(void)
+{
+}
+static inline gboolean
+spellcheck_is_misspelled(const char* word)
+{
+    return FALSE;
+}
+static inline gboolean
+spellcheck_set_lang(const char* lang)
+{
+    return FALSE;
+}
+static inline const char*
+spellcheck_get_lang(void)
+{
+    return NULL;
+}
+
+#endif
+
+#endif
diff --git a/src/ui/console.c b/src/ui/console.c
index 3ff31e77..57ca3fda 100644
--- a/src/ui/console.c
+++ b/src/ui/console.c
@@ -1270,6 +1270,21 @@ cons_splash_setting(void)
         cons_show("Splash screen (/splash)             : OFF");
 }
 
+void
+cons_spellcheck_setting(void)
+{
+#ifdef HAVE_SPELLCHECK
+    if (prefs_get_boolean(PREF_SPELLCHECK_ENABLE)) {
+        auto_gchar gchar* lang = prefs_get_string(PREF_SPELLCHECK_LANG);
+        cons_show("Spellcheck (/spellcheck)            : ON (%s)", lang);
+    } else {
+        cons_show("Spellcheck (/spellcheck)            : OFF");
+    }
+#else
+    cons_show("Spellcheck (/spellcheck)            : built without spellcheck support");
+#endif
+}
+
 void
 cons_occupants_setting(void)
 {
@@ -1589,6 +1604,7 @@ cons_show_ui_prefs(void)
     cons_beep_setting();
     cons_flash_setting();
     cons_splash_setting();
+    cons_spellcheck_setting();
     cons_winpos_setting();
     cons_wrap_setting();
     cons_time_setting();
@@ -2572,6 +2588,7 @@ cons_theme_properties(void)
     _cons_theme_prop(console, THEME_RECEIPT_SENT, "receipt.sent");
 
     _cons_theme_prop(console, THEME_INPUT_TEXT, "input.text");
+    _cons_theme_prop(console, THEME_INPUT_MISSPELLED, "input.misspelled");
 
     cons_show("");
 }
diff --git a/src/ui/inputwin.c b/src/ui/inputwin.c
index e96fa719..60c58894 100644
--- a/src/ui/inputwin.c
+++ b/src/ui/inputwin.c
@@ -50,6 +50,7 @@
 #include "xmpp/roster_list.h"
 #include "xmpp/chat_state.h"
 #include "tools/editor.h"
+#include "tools/spellcheck.h"
 
 static WINDOW* inp_win;
 static int pad_start = 0;
@@ -327,6 +328,8 @@ _inp_write(char* line, int offset)
     getyx(inp_win, y, x);
     col += x;
 
+    gboolean do_spell = prefs_get_boolean(PREF_SPELLCHECK_ENABLE) && (line[0] != '/');
+
     for (size_t i = 0; line[i] != '\0'; i++) {
         char* c = &line[i];
         char retc[PROF_MB_CUR_MAX] = { 0 };
@@ -348,6 +351,47 @@ _inp_write(char* line, int offset)
             i += ch_len - 1;
         }
 
+        if (do_spell) {
+            gunichar uc = g_utf8_get_char(c);
+            if (g_unichar_isalnum(uc) || uc == '\'') {
+                // start of a word
+                size_t start = i - (ch_len - 1);
+                size_t end = start + ch_len;
+                while (line[end] != '\0') {
+                    size_t next_ch_len = mbrlen(&line[end], MB_CUR_MAX, NULL);
+                    if (next_ch_len == (size_t)-2 || next_ch_len == (size_t)-1)
+                        break;
+                    gunichar next_uc = g_utf8_get_char(&line[end]);
+                    if (!g_unichar_isalnum(next_uc) && next_uc != '\'')
+                        break;
+                    end += next_ch_len;
+                }
+
+                char* word = g_strndup(&line[start], end - start);
+                gboolean misspelled = spellcheck_is_misspelled(word);
+                g_free(word);
+
+                if (misspelled) {
+                    wattron(inp_win, theme_attrs(THEME_INPUT_MISSPELLED));
+                }
+
+                // add the word
+                size_t word_pos = start;
+                while (word_pos < end) {
+                    size_t cur_ch_len = mbrlen(&line[word_pos], MB_CUR_MAX, NULL);
+                    waddnstr(inp_win, &line[word_pos], cur_ch_len);
+                    word_pos += cur_ch_len;
+                }
+
+                if (misspelled) {
+                    wattroff(inp_win, theme_attrs(THEME_INPUT_MISSPELLED));
+                }
+
+                i = end - 1;
+                continue;
+            }
+        }
+
         waddnstr(inp_win, c, ch_len);
     }
 
diff --git a/src/ui/ui.h b/src/ui/ui.h
index ea0777db..4ab2ac53 100644
--- a/src/ui/ui.h
+++ b/src/ui/ui.h
@@ -284,6 +284,7 @@ void cons_console_setting(void);
 void cons_flash_setting(void);
 void cons_tray_setting(void);
 void cons_splash_setting(void);
+void cons_spellcheck_setting(void);
 void cons_titlebar_setting(void);
 void cons_vercheck_setting(void);
 void cons_occupants_setting(void);
diff --git a/tests/unittests/ui/stub_ui.c b/tests/unittests/ui/stub_ui.c
index 2d0a200a..80328825 100644
--- a/tests/unittests/ui/stub_ui.c
+++ b/tests/unittests/ui/stub_ui.c
@@ -1008,6 +1008,10 @@ cons_splash_setting(void)
 {
 }
 void
+cons_spellcheck_setting(void)
+{
+}
+void
 cons_vercheck_setting(void)
 {
 }