diff --git a/src/server/language.rs b/src/server/language.rs
index 1c2d7f0..6447fc9 100644
--- a/src/server/language.rs
+++ b/src/server/language.rs
@@ -13,8 +13,9 @@ pub const DE_DE: LanguageIdentifier = langid!("de-DE");
 pub const NL_NL: LanguageIdentifier = langid!("nl-NL");
 pub const FR_FR: LanguageIdentifier = langid!("fr-FR");
 pub const ES_ES: LanguageIdentifier = langid!("es-ES");
+pub const EU_ES: LanguageIdentifier = langid!("eu-ES");
 
-const SUPPORTED_LANGUAGES: &[LanguageIdentifier] = &[EN_US, DE_DE, NL_NL, FR_FR, ES_ES];
+const SUPPORTED_LANGUAGES: &[LanguageIdentifier] = &[EN_US, DE_DE, NL_NL, FR_FR, ES_ES, EU_ES];
 
 /// Get the preferred language from headers
 /// 1. Check for 'lang' cookie
diff --git a/templates/preferences.html b/templates/preferences.html
index 0e03ff6..311efeb 100644
--- a/templates/preferences.html
+++ b/templates/preferences.html
@@ -31,6 +31,10 @@ <h2 class="text-lg font-semibold mb-4 text-purple-900">{{ tr.t("pref-language")
                         class="language-btn px-4 py-2 rounded-lg font-medium transition-all duration-200 border-2 {% if tr.lang_string() == "es-ES" %}bg-gradient-to-r from-orange-500 to-orange-600 text-white border-orange-600 shadow-lg scale-105{% else %}bg-white text-gray-700 border-gray-300 hover:border-orange-400 hover:bg-orange-50 hover:scale-105{% endif %}">
                     🇪🇸 Español
                 </button>
+                <button onclick="setLanguage('eu-ES')"
+                        class="language-btn px-4 py-2 rounded-lg font-medium transition-all duration-200 border-2 {% if tr.lang_string() == "eu-ES" %}bg-gradient-to-r from-orange-500 to-orange-600 text-white border-orange-600 shadow-lg scale-105{% else %}bg-white text-gray-700 border-gray-300 hover:border-orange-400 hover:bg-orange-50 hover:scale-105{% endif %}">
+                    Euskara
+                </button>
             </div>
             <p class="text-sm text-purple-700 mt-3">Your language preference will be saved in a cookie.</p>
         </div>