diff --git a/src/components/TreeSelect/TreeSelect.tsx b/src/components/TreeSelect/TreeSelect.tsx
index 2864ba3f47..424d78ff32 100644
--- a/src/components/TreeSelect/TreeSelect.tsx
+++ b/src/components/TreeSelect/TreeSelect.tsx
@@ -8,6 +8,8 @@ import {SelectControl} from '../Select/components';
 import {SelectPopup} from '../Select/components/SelectPopup/SelectPopup';
 import {TreeList} from '../TreeList';
 import type {TreeListRenderItem} from '../TreeList/types';
+import {OuterAdditionalContent} from '../controls/common/OuterAdditionalContent/OuterAdditionalContent';
+import {errorPropsMapper} from '../controls/utils';
 import {useMobile} from '../mobile';
 import {ListItemView, getListItemClickHandler, useList} from '../useList';
 import type {ListOnItemClick} from '../useList';
@@ -51,6 +53,10 @@ export const TreeSelect = React.forwardRef(function TreeSelect<T, P extends {} =
         disabled = false,
         withExpandedState = true,
         defaultExpandedState = 'expanded',
+        hasClear,
+        errorMessage: propsErrorMessage,
+        errorPlacement: propsErrorPlacement,
+        validationState: propsValidationState,
         onClose,
         onOpenChange,
         onUpdate,
@@ -75,6 +81,19 @@ export const TreeSelect = React.forwardRef(function TreeSelect<T, P extends {} =
     const containerRefLocal = React.useRef<HTMLDivElement>(null);
     const containerRef = propsContainerRef ?? containerRefLocal;
 
+    const {errorMessage, errorPlacement, validationState} = errorPropsMapper({
+        errorMessage: propsErrorMessage,
+        errorPlacement: propsErrorPlacement || 'outside',
+        validationState: propsValidationState,
+    });
+    const errorMessageId = useUniqId();
+
+    const isErrorStateVisible = validationState === 'invalid';
+    const isErrorMsgVisible =
+        isErrorStateVisible && Boolean(errorMessage) && errorPlacement === 'outside';
+    const isErrorIconVisible =
+        isErrorStateVisible && Boolean(errorMessage) && errorPlacement === 'inside';
+
     const handleControlRef = useForkRef(ref, controlRef);
 
     const {toggleOpen, open} = useOpenState({
@@ -165,6 +184,11 @@ export const TreeSelect = React.forwardRef(function TreeSelect<T, P extends {} =
         id: treeSelectId,
         activeItemId: list.state.activeItemId,
         title,
+        errorMessage: isErrorIconVisible ? errorMessage : undefined,
+        errorPlacement,
+        validationState,
+        hasClear,
+        isErrorVisible: isErrorStateVisible,
     };
 
     const togglerNode = renderControl ? (
@@ -234,6 +258,10 @@ export const TreeSelect = React.forwardRef(function TreeSelect<T, P extends {} =
 
                 {slotAfterListBody}
             </SelectPopup>
+            <OuterAdditionalContent
+                errorMessage={isErrorMsgVisible ? errorMessage : null}
+                errorMessageId={errorMessageId}
+            />
         </div>
     );
 }) as <T, P extends {} = {}>(
diff --git a/src/components/TreeSelect/__stories__/TreeSelect.stories.tsx b/src/components/TreeSelect/__stories__/TreeSelect.stories.tsx
index a2f20a9d13..c306c46059 100644
--- a/src/components/TreeSelect/__stories__/TreeSelect.stories.tsx
+++ b/src/components/TreeSelect/__stories__/TreeSelect.stories.tsx
@@ -8,6 +8,8 @@ import {createRandomizedData} from '../../useList/__stories__/utils/makeData';
 import {TreeSelect} from '../TreeSelect';
 import type {TreeSelectProps} from '../types';
 
+import {ErrorStateExample} from './components/ErrorStateExample';
+import type {ErrorStateExampleProps} from './components/ErrorStateExample';
 import {InfinityScrollExample} from './components/InfinityScrollExample';
 import type {InfinityScrollExampleProps} from './components/InfinityScrollExample';
 import {WithDisabledElementsExample} from './components/WithDisabledElementsExample';
@@ -118,6 +120,15 @@ WithDndList.parameters = {
     disableStrictMode: true,
 };
 
+const ErrorStateTemplate: StoryFn<ErrorStateExampleProps> = (props) => {
+    return <ErrorStateExample {...props} />;
+};
+export const ErrorState = ErrorStateTemplate.bind({});
+
+ErrorState.args = {
+    size: 'l',
+};
+
 const WithDisabledElementsTemplate: StoryFn<WithDisabledElementsExampleProps> = (props) => {
     return <WithDisabledElementsExample {...props} />;
 };
diff --git a/src/components/TreeSelect/__stories__/components/ErrorStateExample.tsx b/src/components/TreeSelect/__stories__/components/ErrorStateExample.tsx
new file mode 100644
index 0000000000..1ed946e82f
--- /dev/null
+++ b/src/components/TreeSelect/__stories__/components/ErrorStateExample.tsx
@@ -0,0 +1,47 @@
+import React from 'react';
+
+import {Flex} from '../../../layout';
+import type {ListItemType} from '../../../useList';
+import {TreeSelect} from '../../TreeSelect';
+import type {TreeSelectProps} from '../../types';
+
+type Entity = string;
+
+export interface ErrorStateExampleProps
+    extends Omit<TreeSelectProps<Entity>, 'items' | 'mapItemDataToContentProps'> {}
+
+const items: ListItemType<Entity>[] = ['one', 'two', 'free'];
+const errorMessage = 'A validation error has occurred';
+
+export const ErrorStateExample = ({...props}: ErrorStateExampleProps) => {
+    const containerRef = React.useRef<HTMLDivElement>(null);
+
+    return (
+        <Flex gap="5">
+            <TreeSelect
+                {...props}
+                items={items}
+                getItemId={(id) => id}
+                placeholder="-"
+                containerRef={containerRef}
+                mapItemDataToContentProps={(title) => ({title})}
+                errorMessage={errorMessage}
+                errorPlacement="outside"
+                validationState="invalid"
+                hasClear
+            />
+            <TreeSelect
+                {...props}
+                items={items}
+                getItemId={(id) => id}
+                placeholder="-"
+                containerRef={containerRef}
+                mapItemDataToContentProps={(title) => ({title})}
+                errorMessage={errorMessage}
+                errorPlacement="inside"
+                validationState="invalid"
+                hasClear
+            />
+        </Flex>
+    );
+};
diff --git a/src/components/TreeSelect/types.ts b/src/components/TreeSelect/types.ts
index 8d95ba67e8..6038b64ae9 100644
--- a/src/components/TreeSelect/types.ts
+++ b/src/components/TreeSelect/types.ts
@@ -26,6 +26,19 @@ export type TreeSelectRenderControlProps<T> = {
     activeItemId?: ListItemId;
     title?: string;
     hasClear?: boolean;
+    /**
+     * Determines content of the error message
+     */
+    errorMessage?: React.ReactNode;
+    /**
+     * Determines whether the error message will be placed under the input field as text or in the tooltip
+     */
+    errorPlacement?: 'outside' | 'inside';
+    /**
+     * Describes the validation state
+     */
+    validationState?: 'invalid';
+    isErrorVisible?: boolean;
 };
 
 export type TreeSelectRenderItem<T, P extends {} = {}> = TreeListRenderItem<T, P>;
@@ -39,15 +52,19 @@ interface TreeSelectBehavioralProps<T> extends UseListParsedStateProps<T> {
 
 export interface TreeSelectProps<T, P extends {} = {}>
     extends Omit<TreeListProps<T, P>, 'list' | 'renderContainer' | 'multiple'>,
+        Pick<
+            TreeSelectRenderControlProps<T>,
+            | 'title'
+            | 'placeholder'
+            | 'disabled'
+            | 'hasClear'
+            | 'errorPlacement'
+            | 'validationState'
+            | 'errorMessage'
+        >,
         UseOpenProps,
         TreeSelectBehavioralProps<T> {
-    /**
-     * Control's title attribute value
-     */
-    title?: string;
     value?: ListItemId[];
-    disabled?: boolean;
-    placeholder?: string;
     defaultValue?: ListItemId[] | undefined;
     popupClassName?: string;
     popupWidth?: SelectPopupProps['width'];