diff --git a/src/components/DefinitionList/DefinitionList.scss b/src/components/DefinitionList/DefinitionList.scss
index 0e4749b8d9..5d0e47f10b 100644
--- a/src/components/DefinitionList/DefinitionList.scss
+++ b/src/components/DefinitionList/DefinitionList.scss
@@ -11,7 +11,8 @@ $block: '.#{variables.$ns}definition-list';
     &__group-title {
         margin-block-end: var(--g-spacing-3);
 
-        &:not(:first-of-type) {
+        //decreace specifity to allow groupLabelClassName work properly
+        :where(&:not(:first-of-type)) {
             margin-block-start: var(--g-spacing-5);
         }
     }
@@ -21,19 +22,19 @@ $block: '.#{variables.$ns}definition-list';
         align-items: baseline;
         gap: var(--g-spacing-1);
 
-        & + & {
+        :where(& + &) {
             margin-block-start: var(--g-spacing-4);
         }
     }
 
     &__item_grouped {
-        & + & {
+        :where(& + &) {
             margin-block-start: var(--g-spacing-3);
         }
     }
 
     &_margin {
-        &:not(:first-of-type) {
+        :where(&:not(:first-of-type)) {
             margin-block-start: var(--g-spacing-5);
         }
     }
@@ -136,13 +137,17 @@ $block: '.#{variables.$ns}definition-list';
         flex-direction: column;
         gap: var(--g-spacing-half);
     }
-    #{$block}__item + #{$block}__item {
+    :where(#{$block}__item + #{$block}__item) {
         margin-block-start: var(--g-spacing-3);
     }
-    #{$block}__group-title:not(:first-of-type) {
+    :where(#{$block}__group-title:not(:first-of-type)) {
         margin-block-start: var(--g-spacing-8);
     }
-    #{$block}_margin:not(:first-of-type) {
+    :where(#{$block}_margin:not(:first-of-type)) {
         margin-block-start: var(--g-spacing-8);
     }
 }
+
+.unique {
+    margin: unset;
+}
diff --git a/src/components/DefinitionList/DefinitionList.tsx b/src/components/DefinitionList/DefinitionList.tsx
index c0e35f6bd4..35d9616623 100644
--- a/src/components/DefinitionList/DefinitionList.tsx
+++ b/src/components/DefinitionList/DefinitionList.tsx
@@ -96,6 +96,7 @@ function DefinitionListGrouped({
     items,
     className,
     itemClassName,
+    groupLabelClassName,
     ...rest
 }: DefinitionListGroupedProps) {
     const normalizedItems = React.useMemo(() => {
@@ -103,17 +104,17 @@ function DefinitionListGrouped({
     }, [items]);
 
     return (
-        <div className={b({vertical: rest.direction === 'vertical'}, className)}>
+        <div className={b({vertical: rest.direction === 'vertical'})}>
             {normalizedItems.map((item) => {
                 const {key, label} = item;
 
                 return (
                     <React.Fragment key={key}>
-                        {label && <GroupLabel label={label} />}
+                        {label && <GroupLabel label={label} className={groupLabelClassName} />}
                         {item.items && (
                             <DefinitionListGranular
                                 {...rest}
-                                className={b({margin: !label})}
+                                className={b({margin: !label}, className)}
                                 items={item.items}
                                 itemClassName={b('item', {grouped: Boolean(label)}, itemClassName)}
                             />
diff --git a/src/components/DefinitionList/README.md b/src/components/DefinitionList/README.md
index ee4a7eaf26..f04125f3ad 100644
--- a/src/components/DefinitionList/README.md
+++ b/src/components/DefinitionList/README.md
@@ -63,16 +63,17 @@ LANDING_BLOCK-->
 
 ## Properties
 
-| Property        | Type                           | Required  | Default      | Description                                                                                         |
-| :-------------- | :----------------------------- | :-------: | :----------- | :-------------------------------------------------------------------------------------------------- |
-| [items](#items) | `DefinitionListItem[]`         |    yes    |              | Items of the list                                                                                   |
-| responsive      | `boolean`                      |           |              | If set to `true` list will take 100% width of its parent                                            |
-| direction       | `'horizontal'` \| `'vertical'` |           | 'horizontal' | If set to `vertical` content will be located under name and list will take 100% width of its parent |
-| nameMaxWidth    | `number`                       |           |              | Maximum width of term                                                                               |
-| contentMaxWidth | `number \| 'auto'`             |           | 'auto'       | Maximum width of definition                                                                         |
-| className       | `string`                       |           |              | Class name for the list container                                                                   |
-| itemClassName   | `string`                       |           |              | Class name for the list item                                                                        |
-| copyPosition    | `'inside' \| 'outside'`        | 'outside' |              | If set to `inside`, copy icon will be placed over definition                                        |
+| Property            | Type                           | Required  | Default      | Description                                                                                         |
+| :------------------ | :----------------------------- | :-------: | :----------- | :-------------------------------------------------------------------------------------------------- |
+| [items](#items)     | `DefinitionListItem[]`         |    yes    |              | Items of the list                                                                                   |
+| responsive          | `boolean`                      |           |              | If set to `true` list will take 100% width of its parent                                            |
+| direction           | `'horizontal'` \| `'vertical'` |           | 'horizontal' | If set to `vertical` content will be located under name and list will take 100% width of its parent |
+| nameMaxWidth        | `number`                       |           |              | Maximum width of term                                                                               |
+| contentMaxWidth     | `number \| 'auto'`             |           | 'auto'       | Maximum width of definition                                                                         |
+| className           | `string`                       |           |              | Class name for the definition list (for every granular definition list in group view)               |
+| itemClassName       | `string`                       |           |              | Class name for the list item                                                                        |
+| groupLabelClassName | `string`                       |           |              | Class name for the group label in group view                                                        |
+| copyPosition        | `'inside' \| 'outside'`        | 'outside' |              | If set to `inside`, copy icon will be placed over definition                                        |
 
 ### Items
 
diff --git a/src/components/DefinitionList/__tests__/DefinitionList.test.tsx b/src/components/DefinitionList/__tests__/DefinitionList.test.tsx
index 3299326be4..7b01fd2d65 100644
--- a/src/components/DefinitionList/__tests__/DefinitionList.test.tsx
+++ b/src/components/DefinitionList/__tests__/DefinitionList.test.tsx
@@ -82,6 +82,18 @@ describe('components: DefinitionList', () => {
         const component = screen.getByText('Test group');
         expect(component).toBeVisible();
     });
+    it('should render group label class name', () => {
+        const items = [
+            {
+                label: 'Test group',
+                items: [{name: 'test1', content: 'value1'}],
+            },
+        ];
+        getComponent({items, groupLabelClassName: 'test'});
+
+        const component = screen.getByText('Test group').parentElement;
+        expect(component).toHaveClass('test');
+    });
     it('should render grouped items', () => {
         const items = [
             {
diff --git a/src/components/DefinitionList/components/GroupLabel.tsx b/src/components/DefinitionList/components/GroupLabel.tsx
index 8cbcd7ef8d..0fed188afc 100644
--- a/src/components/DefinitionList/components/GroupLabel.tsx
+++ b/src/components/DefinitionList/components/GroupLabel.tsx
@@ -5,11 +5,12 @@ import {b} from '../utils';
 
 interface GroupLabelProps {
     label: React.ReactNode;
+    className?: string;
 }
 
-export function GroupLabel({label}: GroupLabelProps) {
+export function GroupLabel({label, className}: GroupLabelProps) {
     return (
-        <div className={b('group-title')}>
+        <div className={b('group-title', className)}>
             <Text variant="subheader-1" color="complementary">
                 {label}
             </Text>
diff --git a/src/components/DefinitionList/types.ts b/src/components/DefinitionList/types.ts
index 7e25841caf..2e307a362e 100644
--- a/src/components/DefinitionList/types.ts
+++ b/src/components/DefinitionList/types.ts
@@ -32,6 +32,7 @@ export interface DefinitionListProps extends QAProps {
     contentMaxWidth?: number | 'auto';
     className?: string;
     itemClassName?: string;
+    groupLabelClassName?: string;
 }
 
 export interface DefinitionListGranularProps extends Omit<DefinitionListProps, 'items'> {