diff --git a/docs/how-to/integrations/machine-translation.md b/docs/how-to/integrations/machine-translation.md
index 653bba0d..93976430 100644
--- a/docs/how-to/integrations/machine-translation.md
+++ b/docs/how-to/integrations/machine-translation.md
@@ -127,6 +127,13 @@ WAGTAILLOCALIZE_MACHINE_TRANSLATOR = {
         # Optional DeepL API setting. Accepts "default", "prefer_more" or "prefer_less".\
         # For more information see the API docs https://www.deepl.com/docs-api/translate-text/
         "FORMALITY": "<Your DeepL formality preference here>",
+        # Optional DeepL Glossary IDs by (source, target) language pairs
+        "GLOSSARY_IDS": {
+            ("EN", "ES"): "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
+            ("EN", "FR"): "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
+        },
+        # Optional timeout for the request to the DeepL API
+        "TIMEOUT": 30,
     },
 }
 ```
diff --git a/wagtail_localize/machine_translators/deepl.py b/wagtail_localize/machine_translators/deepl.py
index ba29318a..1f4dfc18 100644
--- a/wagtail_localize/machine_translators/deepl.py
+++ b/wagtail_localize/machine_translators/deepl.py
@@ -28,27 +28,43 @@ def get_api_endpoint(self):
             return "https://api-free.deepl.com/v2/translate"
         return "https://api.deepl.com/v2/translate"
 
-    def translate(self, source_locale, target_locale, strings):
+    def get_parameters(self, source_locale, target_locale, strings):
+        source_lang = language_code(source_locale.language_code)
+        target_lang = language_code(target_locale.language_code, is_target=True)
+
         parameters = {
             "auth_key": self.options["AUTH_KEY"],
             "text": [string.data for string in strings],
             "tag_handling": "xml",
-            "source_lang": language_code(source_locale.language_code),
-            "target_lang": language_code(target_locale.language_code, is_target=True),
+            "source_lang": source_lang,
+            "target_lang": target_lang,
         }
 
-        if self.options.get("FORMALITY"):
-            if self.options["FORMALITY"] in SUPPORTED_FORMALITY_OPTIONS:
-                parameters["formality"] = self.options["FORMALITY"]
+        if formality := self.options.get("FORMALITY"):
+            if formality in SUPPORTED_FORMALITY_OPTIONS:
+                parameters["formality"] = formality
+            else:
+                warnings.warn(
+                    f"Unsupported formality option '{formality}'. "
+                    f"Supported options are: {', '.join(SUPPORTED_FORMALITY_OPTIONS)}"
+                )
+
+        if glossaries := self.options.get("GLOSSARY_IDS"):
+            lang_pair = (source_lang, target_lang)
+            if glossary_id := glossaries.get(lang_pair):
+                parameters["glossary_id"] = glossary_id
             else:
                 warnings.warn(
-                    f"Unsupported formality option '{self.options['FORMALITY']}'. Supported options are: {', '.join(SUPPORTED_FORMALITY_OPTIONS)}"
+                    f"No glossary defined for (source, target) pair: {lang_pair}"
                 )
 
+        return parameters
+
+    def translate(self, source_locale, target_locale, strings):
         response = requests.post(
             self.get_api_endpoint(),
-            parameters,
-            timeout=30,
+            self.get_parameters(source_locale, target_locale, strings),
+            timeout=int(self.options.get("TIMEOUT", 30)),
         )
 
         return {
diff --git a/wagtail_localize/machine_translators/tests/test_deepl_translator.py b/wagtail_localize/machine_translators/tests/test_deepl_translator.py
index e9570314..bbd46dce 100644
--- a/wagtail_localize/machine_translators/tests/test_deepl_translator.py
+++ b/wagtail_localize/machine_translators/tests/test_deepl_translator.py
@@ -33,6 +33,28 @@
     },
 }
 
+DEEPL_SETTINGS_WITH_GLOSSARY_IDS = {
+    "CLASS": "wagtail_localize.machine_translators.deepl.DeepLTranslator",
+    "OPTIONS": {
+        "AUTH_KEY": "asd-23-ssd-243-adsf-dummy-auth-key:bla",
+        "GLOSSARY_IDS": {
+            ("EN", "DE"): "test-id-de",
+            ("EN", "FR"): "test-id-fr",
+        },
+    },
+}
+
+DEEPL_SETTINGS_WITH_MISSING_GLOSSARY_IDS = {
+    "CLASS": "wagtail_localize.machine_translators.deepl.DeepLTranslator",
+    "OPTIONS": {
+        "AUTH_KEY": "asd-23-ssd-243-adsf-dummy-auth-key:bla",
+        "GLOSSARY_IDS": {
+            ("EN", "FR"): "test-id-fr",
+            ("EN", "DE"): "test-id-de",
+        },
+    },
+}
+
 
 class TestDeeplTranslator(TestCase):
     @override_settings(WAGTAILLOCALIZE_MACHINE_TRANSLATOR=DEEPL_SETTINGS_FREE_ENDPOINT)
@@ -120,3 +142,36 @@ def test_language_code_as_target(self):
         for code, expected_value in mapping.items():
             with self.subTest(f"Testing language_code with {code} as target"):
                 self.assertEqual(expected_value, language_code(code, is_target=True))
+
+    @override_settings(
+        WAGTAILLOCALIZE_MACHINE_TRANSLATOR=DEEPL_SETTINGS_WITH_GLOSSARY_IDS
+    )
+    @patch("requests.post")
+    def test_translate_with_glossary_ids(self, mock_post):
+        translator = get_machine_translator()
+        source_locale = Mock(language_code="en")
+        target_locale = Mock(language_code="de")
+        strings = [StringValue("Test string")]
+
+        translator.translate(source_locale, target_locale, strings)
+
+        mock_post.assert_called_once()
+        called_args, called_kwargs = mock_post.call_args
+        self.assertIn("glossary_id", called_args[1])
+        self.assertEqual(called_args[1]["glossary_id"], "test-id-de")
+
+    @override_settings(
+        WAGTAILLOCALIZE_MACHINE_TRANSLATOR=DEEPL_SETTINGS_WITH_MISSING_GLOSSARY_IDS
+    )
+    @patch("requests.post")
+    def test_translate_with_missing_glossary_ids(self, mock_post):
+        translator = get_machine_translator()
+        source_locale = Mock(language_code="en")
+        target_locale = Mock(language_code="es")
+        strings = [StringValue("Test string")]
+
+        translator.translate(source_locale, target_locale, strings)
+
+        mock_post.assert_called_once()
+        called_args, called_kwargs = mock_post.call_args
+        self.assertNotIn("glossary_id", called_args[1])