diff --git a/frontend/public/components/modals/impersonate-user-modal.tsx b/frontend/public/components/modals/impersonate-user-modal.tsx
new file mode 100644
index 0000000000..66a3f435e4
--- /dev/null
+++ b/frontend/public/components/modals/impersonate-user-modal.tsx
@@ -0,0 +1,357 @@
+import * as React from 'react';
+import { useTranslation } from 'react-i18next';
+import {
+  Button,
+  Form,
+  FormGroup,
+  TextInput,
+  Alert,
+  AlertVariant,
+  Popover,
+  Select,
+  SelectList,
+  SelectOption,
+  MenuToggle,
+  MenuToggleElement,
+  Label,
+  Badge,
+  TextInputGroup,
+  TextInputGroupMain,
+  TextInputGroupUtilities,
+} from '@patternfly/react-core';
+import { HelpIcon } from '@patternfly/react-icons/dist/esm/icons/help-icon';
+import { TimesIcon } from '@patternfly/react-icons/dist/esm/icons/times-icon';
+import { Modal, ModalVariant } from '@patternfly/react-core/deprecated';
+
+export interface ImpersonateUserModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onImpersonate: (username: string, groups: string[]) => void;
+  prefilledUsername?: string;
+  isUsernameReadonly?: boolean;
+}
+
+export const ImpersonateUserModal: React.FC<ImpersonateUserModalProps> = ({
+  isOpen,
+  onClose,
+  onImpersonate,
+  prefilledUsername = '',
+  isUsernameReadonly = false,
+}) => {
+  const { t } = useTranslation();
+  const [username, setUsername] = React.useState(prefilledUsername);
+  const [selectedGroups, setSelectedGroups] = React.useState<string[]>([]);
+  const [usernameError, setUsernameError] = React.useState('');
+  const [isGroupSelectOpen, setIsGroupSelectOpen] = React.useState(false);
+  const [showAllGroups, setShowAllGroups] = React.useState(false);
+  const [groupSearchFilter, setGroupSearchFilter] = React.useState('');
+
+  // Mock group options - in real implementation, these would come from API
+  const availableGroups = React.useMemo(
+    () => [
+      'developers',
+      'test-group-1',
+      'test-group-2',
+      'test-group-3',
+      'admins',
+      'monitoring',
+      'operators',
+      'viewers',
+      'editors',
+      'system:authenticated',
+      'system:unauthenticated',
+      'system:serviceaccounts',
+      'system:serviceaccounts:kube-system',
+      'system:serviceaccounts:openshift-kube-apiserver',
+      'system:serviceaccounts:openshift-kube-controller-manager',
+      'system:serviceaccounts:openshift-kube-scheduler',
+      'system:serviceaccounts:openshift-kube-proxy',
+      'system:serviceaccounts:openshift-kube-router',
+    ],
+    [],
+  );
+
+  const handleClose = React.useCallback(() => {
+    setUsername(prefilledUsername);
+    setSelectedGroups([]);
+    setUsernameError('');
+    onClose();
+  }, [prefilledUsername, onClose]);
+
+  const handleUsernameChange = (value: string) => {
+    setUsername(value);
+    if (usernameError) {
+      setUsernameError('');
+    }
+  };
+
+  const handleGroupSelect = (_event: React.MouseEvent | undefined, value: string | number) => {
+    const group = value as string;
+    if (selectedGroups.includes(group)) {
+      // Deselect if already selected
+      setSelectedGroups(selectedGroups.filter((g) => g !== group));
+    } else {
+      // Add to selection
+      setSelectedGroups([...selectedGroups, group]);
+    }
+    // Keep dropdown open - don't call setIsGroupSelectOpen(false)
+  };
+
+  const handleGroupRemove = (groupToRemove: string) => {
+    setSelectedGroups(selectedGroups.filter((g) => g !== groupToRemove));
+  };
+
+  const validateForm = (): boolean => {
+    if (!username.trim()) {
+      setUsernameError(t('public~Username is required'));
+      return false;
+    }
+    return true;
+  };
+
+  const handleImpersonate = () => {
+    if (validateForm()) {
+      handleClose();
+      onImpersonate(username.trim(), selectedGroups);
+    }
+  };
+
+  // Reset form when modal opens with new prefilled username
+  React.useEffect(() => {
+    if (isOpen) {
+      setUsername(prefilledUsername);
+      setSelectedGroups([]);
+      setUsernameError('');
+      setGroupSearchFilter('');
+    }
+  }, [isOpen, prefilledUsername]);
+
+  // Show first 2 groups, then +N badge (unless expanded)
+  const MAX_VISIBLE_CHIPS = 2;
+  const visibleGroups = showAllGroups ? selectedGroups : selectedGroups.slice(0, MAX_VISIBLE_CHIPS);
+  const remainingCount = selectedGroups.length - MAX_VISIBLE_CHIPS;
+
+  // Filter groups based on search input
+  const filteredGroups = React.useMemo(() => {
+    if (!groupSearchFilter) {
+      return availableGroups;
+    }
+    return availableGroups.filter((group) =>
+      group.toLowerCase().includes(groupSearchFilter.toLowerCase()),
+    );
+  }, [groupSearchFilter, availableGroups]);
+
+  const textInputGroupRef = React.useRef<HTMLDivElement>(null);
+
+  const toggle = (toggleRef: React.Ref<MenuToggleElement>) => (
+    <MenuToggle
+      ref={toggleRef}
+      variant="typeahead"
+      onClick={() => setIsGroupSelectOpen(!isGroupSelectOpen)}
+      isExpanded={isGroupSelectOpen}
+      style={{ width: '100%' }}
+    >
+      <TextInputGroup isPlain>
+        <TextInputGroupMain
+          value={groupSearchFilter}
+          onClick={() => setIsGroupSelectOpen(!isGroupSelectOpen)}
+          onChange={(_event, value) => {
+            setGroupSearchFilter(value);
+            if (!isGroupSelectOpen) {
+              setIsGroupSelectOpen(true);
+            }
+          }}
+          autoComplete="off"
+          innerRef={textInputGroupRef}
+          placeholder={t('public~Enter groups')}
+          role="combobox"
+          isExpanded={isGroupSelectOpen}
+          aria-controls="select-typeahead-listbox"
+        />
+        <TextInputGroupUtilities>
+          {groupSearchFilter && (
+            <Button
+              variant="plain"
+              onClick={() => {
+                setGroupSearchFilter('');
+                textInputGroupRef?.current?.focus();
+              }}
+              aria-label="Clear input"
+            >
+              <TimesIcon aria-hidden />
+            </Button>
+          )}
+        </TextInputGroupUtilities>
+      </TextInputGroup>
+    </MenuToggle>
+  );
+
+  return (
+    <Modal
+      variant={ModalVariant.small}
+      title={t('public~Impersonate user')}
+      isOpen={isOpen}
+      onClose={handleClose}
+      actions={[
+        <Button
+          key="impersonate"
+          variant="primary"
+          onClick={handleImpersonate}
+          data-test="impersonate-button"
+        >
+          {t('public~Impersonate')}
+        </Button>,
+        <Button key="cancel" variant="link" onClick={handleClose} data-test="cancel-button">
+          {t('public~Cancel')}
+        </Button>,
+      ]}
+    >
+      <Form>
+        <Alert
+          variant={AlertVariant.warning}
+          isInline
+          title={t('public~Impersonating a user or group grants you their exact permissions.')}
+        />
+
+        <FormGroup
+          label={
+            <span style={{ display: 'inline-flex', alignItems: 'center', gap: '0.25rem' }}>
+              {t('public~Username')}
+              <Popover
+                headerContent={t('public~Username')}
+                bodyContent={t('public~The name of the user to impersonate')}
+              >
+                <button
+                  type="button"
+                  aria-label={t('public~More info for username field')}
+                  onClick={(e) => e.preventDefault()}
+                  style={{
+                    background: 'none',
+                    border: 'none',
+                    padding: 0,
+                    cursor: 'pointer',
+                    color: '#6A6E73',
+                    display: 'inline-flex',
+                    alignItems: 'center',
+                    lineHeight: 1,
+                  }}
+                >
+                  <HelpIcon style={{ fontSize: '14px' }} />
+                </button>
+              </Popover>
+            </span>
+          }
+          fieldId="impersonate-username"
+          isRequired
+        >
+          <TextInput
+            id="impersonate-username"
+            name="username"
+            value={username}
+            onChange={(_event, value) => handleUsernameChange(value)}
+            readOnly={isUsernameReadonly}
+            placeholder={t('public~Enter a username')}
+            data-test="username-input"
+            validated={usernameError ? 'error' : 'default'}
+          />
+          {usernameError && (
+            <div style={{ color: '#C9190B', fontSize: '14px', marginTop: '8px' }}>
+              <span style={{ marginRight: '4px' }}>⚠</span>
+              {usernameError}
+            </div>
+          )}
+        </FormGroup>
+
+        <FormGroup
+          label={
+            <span style={{ display: 'inline-flex', alignItems: 'center', gap: '0.25rem' }}>
+              {t('public~Groups')}
+              <Popover
+                headerContent={t('public~Groups')}
+                bodyContent={t('public~The groups to impersonate the user with')}
+              >
+                <button
+                  type="button"
+                  aria-label={t('public~More info for groups field')}
+                  onClick={(e) => e.preventDefault()}
+                  style={{
+                    background: 'none',
+                    border: 'none',
+                    padding: 0,
+                    cursor: 'pointer',
+                    color: '#6A6E73',
+                    display: 'inline-flex',
+                    alignItems: 'center',
+                    lineHeight: 1,
+                  }}
+                >
+                  <HelpIcon style={{ fontSize: '14px' }} />
+                </button>
+              </Popover>
+            </span>
+          }
+          fieldId="impersonate-groups"
+        >
+          <Select
+            id="impersonate-groups"
+            isOpen={isGroupSelectOpen}
+            onOpenChange={(open) => setIsGroupSelectOpen(open)}
+            onSelect={handleGroupSelect}
+            toggle={toggle}
+            isScrollable
+            maxMenuHeight="300px"
+          >
+            <SelectList id="select-typeahead-listbox">
+              {filteredGroups.length === 0 ? (
+                <SelectOption isDisabled>{t('public~No results found')}</SelectOption>
+              ) : (
+                filteredGroups.map((group) => (
+                  <SelectOption
+                    key={group}
+                    value={group}
+                    isSelected={selectedGroups.includes(group)}
+                  >
+                    {group}
+                  </SelectOption>
+                ))
+              )}
+            </SelectList>
+          </Select>
+
+          {selectedGroups.length > 0 && (
+            <div
+              style={{
+                marginTop: '12px',
+                display: 'flex',
+                flexWrap: 'wrap',
+                gap: '8px',
+                alignItems: 'center',
+              }}
+            >
+              {visibleGroups.map((group) => (
+                <Label key={group} onClose={() => handleGroupRemove(group)} color="blue">
+                  {group}
+                </Label>
+              ))}
+              {!showAllGroups && remainingCount > 0 && (
+                <Badge
+                  isRead
+                  style={{
+                    backgroundColor: '#0066CC',
+                    color: 'white',
+                    borderRadius: '12px',
+                    padding: '2px 8px',
+                    cursor: 'pointer',
+                  }}
+                  onClick={() => setShowAllGroups(true)}
+                >
+                  +{remainingCount}
+                </Badge>
+              )}
+            </div>
+          )}
+        </FormGroup>
+      </Form>
+    </Modal>
+  );
+};
diff --git a/frontend/public/locales/en/public.json b/frontend/public/locales/en/public.json
index 088b06321d..0ddb08fe23 100644
--- a/frontend/public/locales/en/public.json
+++ b/frontend/public/locales/en/public.json
@@ -937,6 +937,17 @@
   "Total size": "Total size",
   "requestSize": "requestSize",
   "Expand": "Expand",
+  "Username is required": "Username is required",
+  "Enter groups": "Enter groups",
+  "Impersonate user": "Impersonate user",
+  "Impersonate": "Impersonate",
+  "Impersonating a user or group grants you their exact permissions.": "Impersonating a user or group grants you their exact permissions.",
+  "The name of the user to impersonate": "The name of the user to impersonate",
+  "More info for username field": "More info for username field",
+  "Enter a username": "Enter a username",
+  "The groups to impersonate the user with": "The groups to impersonate the user with",
+  "More info for groups field": "More info for groups field",
+  "No results found": "No results found",
   "Edit {{description}}": "Edit {{description}}",
   "Edit labels": "Edit labels",
   "Labels help you organize and select resources. Adding labels below will let you query for objects that have similar, overlapping or dissimilar labels.": "Labels help you organize and select resources. Adding labels below will let you query for objects that have similar, overlapping or dissimilar labels.",