diff --git a/src/extraction/grammars.ts b/src/extraction/grammars.ts
index d2e0de44..d8141d30 100644
--- a/src/extraction/grammars.ts
+++ b/src/extraction/grammars.ts
@@ -34,6 +34,7 @@ const WASM_GRAMMAR_FILES: Record<GrammarLanguage, string> = {
   kotlin: 'tree-sitter-kotlin.wasm',
   dart: 'tree-sitter-dart.wasm',
   pascal: 'tree-sitter-pascal.wasm',
+  mql5: 'tree-sitter-mql5.wasm'
 };
 
 /**
@@ -74,6 +75,9 @@ export const EXTENSION_MAP: Record<string, Language> = {
   '.lpr': 'pascal',
   '.dfm': 'pascal',
   '.fmx': 'pascal',
+  '.mq5': 'mql5',
+  '.mqh': 'mql5',
+  '.mql5': 'mql5',
 };
 
 /**
@@ -99,12 +103,12 @@ export async function initGrammars(): Promise<void> {
   const entries = Object.entries(WASM_GRAMMAR_FILES) as [GrammarLanguage, string][];
   for (const [lang, wasmFile] of entries) {
     try {
-        // Pascal ships its own WASM (not in tree-sitter-wasms)
-        const wasmPath = lang === 'pascal'
-          ? path.join(__dirname, 'wasm', wasmFile)
-          : require.resolve(`tree-sitter-wasms/out/${wasmFile}`);
-        const language = await WasmLanguage.load(wasmPath);
-        languageCache.set(lang, language);
+      // Pascal & MQL5 ships its own WASM (not in tree-sitter-wasms)
+      const wasmPath = (lang === 'pascal' || lang === 'mql5')
+        ? path.join(__dirname, 'wasm', wasmFile)
+        : require.resolve(`tree-sitter-wasms/out/${wasmFile}`);
+      const language = await WasmLanguage.load(wasmPath);
+      languageCache.set(lang, language);
     } catch (error) {
       const message = error instanceof Error ? error.message : String(error);
       console.warn(`[CodeGraph] Failed to load ${lang} grammar — parsing will be unavailable: ${message}`);
@@ -214,6 +218,7 @@ export function getLanguageDisplayName(language: Language): string {
     svelte: 'Svelte',
     liquid: 'Liquid',
     pascal: 'Pascal / Delphi',
+    mql5: 'mql5',
     unknown: 'Unknown',
   };
   return names[language] || language;
diff --git a/src/extraction/tree-sitter.ts b/src/extraction/tree-sitter.ts
index 4712bb46..7b6277e6 100644
--- a/src/extraction/tree-sitter.ts
+++ b/src/extraction/tree-sitter.ts
@@ -813,6 +813,65 @@ const EXTRACTORS: Partial<Record<Language, LanguageExtractor>> = {
       return node.type === 'declConst';
     },
   },
+  mql5: {
+    functionTypes: ['function_definition'],
+    classTypes: ['class_definition'],
+    methodTypes: ['function_definition'],
+    interfaceTypes: [],
+    structTypes: ['struct_definition'],
+    enumTypes: ['enum_definition'],
+    typeAliasTypes: ['type'],
+    importTypes: ['preproc_include'],
+    callTypes: ['function_call'],
+    variableTypes: ['variable_declaration'],
+    nameField: 'name',
+    bodyField: 'block',
+    paramsField: 'parameter',
+    returnField: 'type',
+
+    getSignature: (node, source) => {
+      const params = getChildByField(node, 'parameter');
+      const returnType = getChildByField(node, 'type');
+
+      let sig = '';
+
+      if (params) {
+        sig += getNodeText(params, source);
+      }
+
+      if (returnType) {
+        sig = `${getNodeText(returnType, source)} ${sig}`;
+      }
+
+      return sig || undefined;
+    },
+
+    getVisibility: (_node) => {
+      // MQL5 n'a pas de visibilité explicite
+      return 'public';
+    },
+
+    isExported: (_node, _source) => {
+      // Tout est visible dans MQL5
+      return true;
+    },
+
+    isStatic: (node) => {
+      for (let i = 0; i < node.childCount; i++) {
+        const child = node.child(i);
+        if (child?.type === 'static') return true;
+      }
+      return false;
+    },
+
+    isConst: (node) => {
+      for (let i = 0; i < node.childCount; i++) {
+        const child = node.child(i);
+        if (child?.type === 'const') return true;
+      }
+      return false;
+    }
+  }
 };
 
 // TSX and JSX use the same extractors as their base languages
@@ -1392,7 +1451,7 @@ export class TreeSitterExtractor {
 
     // Extract variable declarators based on language
     if (this.language === 'typescript' || this.language === 'javascript' ||
-        this.language === 'tsx' || this.language === 'jsx') {
+      this.language === 'tsx' || this.language === 'jsx') {
       // Handle lexical_declaration and variable_declaration
       // These contain one or more variable_declarator children
       for (let i = 0; i < node.namedChildCount; i++) {
@@ -1588,7 +1647,7 @@ export class TreeSitterExtractor {
     let moduleName = '';
 
     if (this.language === 'typescript' || this.language === 'javascript' ||
-        this.language === 'tsx' || this.language === 'jsx') {
+      this.language === 'tsx' || this.language === 'jsx') {
       const source = getChildByField(node, 'source');
       if (source) {
         moduleName = getNodeText(source, this.source).replace(/['"]/g, '');
@@ -1689,9 +1748,9 @@ export class TreeSitterExtractor {
         if (!firstChild) return getNodeText(scopedNode, this.source);
 
         if (firstChild.type === 'identifier' ||
-            firstChild.type === 'crate' ||
-            firstChild.type === 'super' ||
-            firstChild.type === 'self') {
+          firstChild.type === 'crate' ||
+          firstChild.type === 'super' ||
+          firstChild.type === 'self') {
           return getNodeText(firstChild, this.source);
         } else if (firstChild.type === 'scoped_identifier') {
           return getRootModule(firstChild);
diff --git a/src/extraction/wasm/tree-sitter-mql5.wasm b/src/extraction/wasm/tree-sitter-mql5.wasm
new file mode 100755
index 00000000..14442f53
Binary files /dev/null and b/src/extraction/wasm/tree-sitter-mql5.wasm differ
diff --git a/src/types.ts b/src/types.ts
index fe64faa4..ec896446 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -75,6 +75,7 @@ export type Language =
   | 'svelte'
   | 'liquid'
   | 'pascal'
+  | 'mql5'
   | 'unknown';
 
 // =============================================================================