diff --git a/docs/schema/index.rst b/docs/schema/index.rst
index 25314f241..f3bdffdd8 100644
--- a/docs/schema/index.rst
+++ b/docs/schema/index.rst
@@ -1035,6 +1035,7 @@ Array fields store lists of homogeneous typed values:
 - ``items``: Schema for all array elements (required).
   The dictionary can contain any of the basic type schemas outlined above.
   The ``items.type`` field is required.
+- ``uniqueItems``: If set to ``true``, all elements in the array must be unique.
 - ``minItems`` / ``maxItems``: Array size constraints
 - ``contains`` Schema for some elements in the array.
   The dictionary can contain any of the basic type schemas outlined above.
diff --git a/sphinx_needs/schema/config.py b/sphinx_needs/schema/config.py
index 04e4578f6..8e14a0122 100644
--- a/sphinx_needs/schema/config.py
+++ b/sphinx_needs/schema/config.py
@@ -249,6 +249,8 @@ class ExtraOptionMultiValueSchemaType(TypedDict):
     """Minimum number of contains items in the array."""
     maxContains: NotRequired[int]
     """Maximum number of contains items in the array."""
+    uniqueItems: NotRequired[bool]
+    """Whether all items in the array must be unique."""
 
 
 def validate_extra_option_multi_value_schema(
diff --git a/sphinx_needs/schema/jsons/ExtraOptionMultiValueSchemaType.schema.json b/sphinx_needs/schema/jsons/ExtraOptionMultiValueSchemaType.schema.json
index 36b237df4..68950f13c 100644
--- a/sphinx_needs/schema/jsons/ExtraOptionMultiValueSchemaType.schema.json
+++ b/sphinx_needs/schema/jsons/ExtraOptionMultiValueSchemaType.schema.json
@@ -224,6 +224,10 @@
       "const": "array",
       "title": "Type",
       "type": "string"
+    },
+    "uniqueItems": {
+      "title": "Uniqueitems",
+      "type": "boolean"
     }
   },
   "required": [
diff --git a/sphinx_needs/schema/jsons/SchemasRootType.schema.json b/sphinx_needs/schema/jsons/SchemasRootType.schema.json
index b26848046..b42287e86 100644
--- a/sphinx_needs/schema/jsons/SchemasRootType.schema.json
+++ b/sphinx_needs/schema/jsons/SchemasRootType.schema.json
@@ -212,6 +212,10 @@
           "const": "array",
           "title": "Type",
           "type": "string"
+        },
+        "uniqueItems": {
+          "title": "Uniqueitems",
+          "type": "boolean"
         }
       },
       "required": [
diff --git a/tests/schema/__snapshots__/test_schema.ambr b/tests/schema/__snapshots__/test_schema.ambr
index a7e1c2006..421f4711c 100644
--- a/tests/schema/__snapshots__/test_schema.ambr
+++ b/tests/schema/__snapshots__/test_schema.ambr
@@ -3115,6 +3115,40 @@
     }),
   })
 # ---
+# name: test_schemas[schema/fixtures/extra_options-array_unique_items]
+  '''
+  ERROR: Need 'IMPL_1' has schema violations:
+    Severity:       violation
+    Field:          array_field
+    Need path:      IMPL_1
+    Schema path:    options > schema > properties > array_field > uniqueItems
+    Schema message: ["a","a"] has non-unique elements [sn_schema_violation.option_fail]
+  
+  '''
+# ---
+# name: test_schemas[schema/fixtures/extra_options-array_unique_items].1
+  dict({
+    'validated_needs_count': 1,
+    'validation_warnings': dict({
+      'IMPL_1': list([
+        dict({
+          'children': list([
+          ]),
+          'details': dict({
+            'field': 'array_field',
+            'need_path': 'IMPL_1',
+            'schema_path': 'options > schema > properties > array_field > uniqueItems',
+            'severity': 'violation',
+            'validation_msg': '["a","a"] has non-unique elements',
+          }),
+          'log_lvl': 'error',
+          'subtype': 'option_fail',
+          'type': 'sn_schema_violation',
+        }),
+      ]),
+    }),
+  })
+# ---
 # name: test_schemas[schema/fixtures/extra_options-auto_inject_type]
   ''
 # ---
diff --git a/tests/schema/fixtures/extra_options.yml b/tests/schema/fixtures/extra_options.yml
index b12cd0d44..b9a73a5ac 100644
--- a/tests/schema/fixtures/extra_options.yml
+++ b/tests/schema/fixtures/extra_options.yml
@@ -727,3 +727,18 @@ coerce_to_boolean_from_string_error:
     .. impl:: title
         :id: IMPL_1
         :approved: not-a-boolean
+
+array_unique_items:
+  conf: |
+    extensions = ["sphinx_needs"]
+    needs_from_toml = "ubproject.toml"
+  ubproject: |
+    [[needs.extra_options]]
+    name = "array_field"
+    schema.type = "array"
+    schema.items = {type = "string"}
+    schema.uniqueItems = true
+  rst: |
+    .. impl:: title
+        :id: IMPL_1
+        :array_field: a, a