diff --git a/app/_locales/en/messages.json b/app/_locales/en/messages.json
index a948be94930b..083c342e98a1 100644
--- a/app/_locales/en/messages.json
+++ b/app/_locales/en/messages.json
@@ -2567,6 +2567,9 @@
     "message": "This token is an NFT. Add on the $1",
     "description": "$1 is a clickable link with text defined by the 'importNFTPage' key"
   },
+  "nftAlreadyAdded": {
+    "message": "NFT has already been added."
+  },
   "nftDisclaimer": {
     "message": "Disclaimer: MetaMask pulls the media file from the source url. This url sometimes is changed by the marketplace the NFT was minted on."
   },
diff --git a/ui/components/multichain/import-nfts-modal/import-nfts-modal.js b/ui/components/multichain/import-nfts-modal/import-nfts-modal.js
index df02ed6c8c79..91c86348fe48 100644
--- a/ui/components/multichain/import-nfts-modal/import-nfts-modal.js
+++ b/ui/components/multichain/import-nfts-modal/import-nfts-modal.js
@@ -53,6 +53,8 @@ import {
   BannerAlert,
 } from '../../component-library';
 import Tooltip from '../../ui/tooltip';
+import { useNftsCollections } from '../../../hooks/useNftsCollections';
+import { tokenIdExist } from '../../../helpers/utils/util';
 
 export const ImportNftsModal = ({ onClose }) => {
   const t = useI18nContext();
@@ -68,12 +70,14 @@ export const ImportNftsModal = ({ onClose }) => {
     tokenId: initialTokenId,
     ignoreErc20Token,
   } = useSelector((state) => state.appState.importNftsModal);
+  const existingNfts = useNftsCollections();
 
   const [nftAddress, setNftAddress] = useState(initialTokenAddress ?? '');
   const [tokenId, setTokenId] = useState(initialTokenId ?? '');
   const [disabled, setDisabled] = useState(true);
   const [nftAddFailed, setNftAddFailed] = useState(false);
   const trackEvent = useContext(MetaMetricsContext);
+  const [duplicateTokenIdError, setDuplicateTokenIdError] = useState(null);
 
   const handleAddNft = async () => {
     try {
@@ -135,7 +139,23 @@ export const ImportNftsModal = ({ onClose }) => {
   };
 
   const validateAndSetTokenId = (val) => {
-    setDisabled(!isValidHexAddress(nftAddress) || !val || isNaN(Number(val)));
+    setDuplicateTokenIdError(null);
+    // Check if tokenId is already imported
+    const tokenIdExists = tokenIdExist(
+      nftAddress,
+      val,
+      existingNfts.collections,
+    );
+    if (tokenIdExists) {
+      setDuplicateTokenIdError(t('nftAlreadyAdded'));
+    }
+    setDisabled(
+      !isValidHexAddress(nftAddress) ||
+        !val ||
+        isNaN(Number(val)) ||
+        tokenIdExists,
+    );
+
     setTokenId(val);
   };
 
@@ -243,6 +263,8 @@ export const ImportNftsModal = ({ onClose }) => {
                   validateAndSetTokenId(e.target.value);
                   setNftAddFailed(false);
                 }}
+                helpText={duplicateTokenIdError}
+                error={duplicateTokenIdError}
               />
             </Box>
           </Box>
diff --git a/ui/helpers/utils/util.js b/ui/helpers/utils/util.js
index 20ba3656b39d..5d378c2264fd 100644
--- a/ui/helpers/utils/util.js
+++ b/ui/helpers/utils/util.js
@@ -10,7 +10,7 @@ import bowser from 'bowser';
 ///: BEGIN:ONLY_INCLUDE_IN(snaps)
 import { getSnapPrefix } from '@metamask/snaps-utils';
 import { WALLET_SNAP_PERMISSION_KEY } from '@metamask/rpc-methods';
-import { isObject } from '@metamask/utils';
+import { isObject, isStrictHexString } from '@metamask/utils';
 ///: END:ONLY_INCLUDE_IN
 import { CHAIN_IDS, NETWORK_TYPES } from '../../../shared/constants/network';
 import {
@@ -30,7 +30,6 @@ import {
   SNAPS_METADATA,
 } from '../../../shared/constants/snaps';
 ///: END:ONLY_INCLUDE_IN
-
 // formatData :: ( date: <Unix Timestamp> ) -> String
 export function formatDate(date, format = "M/d/y 'at' T") {
   if (!date) {
@@ -631,3 +630,40 @@ export const getNetworkNameFromProviderType = (providerName) => {
 export const isAbleToExportAccount = (keyringType = '') => {
   return !keyringType.includes('Hardware') && !keyringType.includes('Snap');
 };
+
+/**
+ * Checks if a tokenId in Hex or decimal format already exists in an object.
+ *
+ * @param {*} address - collection address.
+ * @param {*} tokId - tokenId to search for
+ * @param {*} obj - object to look into
+ * @returns {boolean} `false` if tokenId does not already exist.
+ */
+export const tokenIdExist = (address, tokId, obj) => {
+  // check if input tokenId is hexadecimal
+  // If it is convert to decimal and compare with existing tokens
+  // if it is decimal convert to hexadecimal and compare
+  const isHex = isStrictHexString(tokId);
+  let convertedTokenId;
+  if (isHex) {
+    // Convert to decimal
+    convertedTokenId = parseInt(tokId, 16);
+  } else {
+    // Convert to hex
+    const decimalNumber = parseInt(tokId, 10); // 10 is the base for decimal
+    convertedTokenId = `0x${decimalNumber.toString(16)}`;
+  }
+
+  if (obj[address]) {
+    const value = obj[address];
+    return lodash.some(value.nfts, (nft) => {
+      return (
+        nft.address === address &&
+        (nft.tokenId.toLowerCase() === tokId.toLowerCase() ||
+          nft.tokenId.toLowerCase() ===
+            convertedTokenId.toString().toLowerCase())
+      );
+    });
+  }
+  return false;
+};
diff --git a/ui/helpers/utils/util.test.js b/ui/helpers/utils/util.test.js
index 77ac796c2d9d..b4ae16d402f6 100644
--- a/ui/helpers/utils/util.test.js
+++ b/ui/helpers/utils/util.test.js
@@ -929,4 +929,72 @@ describe('util', () => {
       expect(util.getNetworkNameFromProviderType('rpc')).toStrictEqual('');
     });
   });
+
+  describe('tokenIdExist()', () => {
+    const data = {
+      '0x2df920B180c58766951395c26ecF1EC2063490Fa': {
+        collectionName: 'Numbers',
+        nfts: [
+          {
+            address: '0x2df920B180c58766951395c26ecF1EC2063490Fa',
+            description: 'Numbers',
+            favorite: false,
+            name: 'Numbers #132',
+            tokenId: '132',
+          },
+        ],
+      },
+      '0x2df920B180c58766951395c26ecF1EC206343334': {
+        collectionName: 'toto',
+        nfts: [
+          {
+            address: '0x2df920B180c58766951395c26ecF1EC206343334',
+            description: 'toto',
+            favorite: false,
+            name: 'toto#3453',
+            tokenId: '3453',
+          },
+        ],
+      },
+    };
+    it('should return true if it exists', () => {
+      expect(
+        util.tokenIdExist(
+          '0x2df920B180c58766951395c26ecF1EC206343334',
+          '3456',
+          data,
+        ),
+      ).toBeTruthy();
+    });
+
+    it('should return true if it exists in decimal format', () => {
+      expect(
+        util.tokenIdExist(
+          '0x2df920B180c58766951395c26ecF1EC206343334',
+          '0xD80',
+          data,
+        ),
+      ).toBeTruthy();
+    });
+
+    it('should return false if it does not exists', () => {
+      expect(
+        util.tokenIdExist(
+          '0x2df920B180c58766951395c26ecF1EC206343334',
+          '1122',
+          data,
+        ),
+      ).toBeFalsy();
+    });
+
+    it('should return false if it address does not exists', () => {
+      expect(
+        util.tokenIdExist(
+          '0xB0BdaBea57B0BDABeA57b0bdABEA57b0BDabEa57',
+          '1122',
+          data,
+        ),
+      ).toBeFalsy();
+    });
+  });
 });