diff --git a/.changes/next-release/bugfix-S3-b27b69fd.json b/.changes/next-release/bugfix-S3-b27b69fd.json
new file mode 100644
index 0000000000..2d628b972d
--- /dev/null
+++ b/.changes/next-release/bugfix-S3-b27b69fd.json
@@ -0,0 +1,5 @@
+{
+  "type": "bugfix",
+  "category": "S3",
+  "description": "Support FIPS for S3 Accesspoint & Object Lambda"
+}
\ No newline at end of file
diff --git a/lib/services/s3.js b/lib/services/s3.js
index 2e63855ad8..a227a33eb6 100644
--- a/lib/services/s3.js
+++ b/lib/services/s3.js
@@ -150,11 +150,12 @@ AWS.util.update(AWS.S3.prototype, {
       if (request._parsedArn.service === 's3') {
         request.addListener('validate', s3util.validateS3AccessPointArn);
         request.addListener('validate', this.validateArnResourceType);
+        request.addListener('validate', this.validateArnRegion);
       } else if (request._parsedArn.service === 's3-outposts') {
         request.addListener('validate', s3util.validateOutpostsAccessPointArn);
         request.addListener('validate', s3util.validateOutpostsArn);
+        request.addListener('validate', s3util.validateArnRegion);
       }
-      request.addListener('validate', s3util.validateArnRegion);
       request.addListener('validate', s3util.validateArnAccount);
       request.addListener('validate', s3util.validateArnService);
       request.addListener('build', this.populateUriFromAccessPointArn);
@@ -196,6 +197,13 @@ AWS.util.update(AWS.S3.prototype, {
     }
   },
 
+  /**
+   * @api private
+   */
+   validateArnRegion: function validateArnRegion(req) {
+    s3util.validateArnRegion(req, { allowFipsEndpoint: true });
+  },
+
   /**
    * Validate resource-type supplied in S3 ARN
    */
@@ -351,6 +359,7 @@ AWS.util.update(AWS.S3.prototype, {
 
     var outpostsSuffix = isOutpostArn ? '.' + accessPointArn.outpostId: '';
     var serviceName = isOutpostArn ? 's3-outposts': 's3-accesspoint';
+    var fipsSuffix = !isOutpostArn && req.service.config.useFipsEndpoint ? '-fips': '';
     var dualStackSuffix = !isOutpostArn && req.service.config.useDualstack ? '.dualstack' : '';
 
     var endpoint = req.httpRequest.endpoint;
@@ -359,7 +368,7 @@ AWS.util.update(AWS.S3.prototype, {
 
     endpoint.hostname = [
       accessPointArn.accessPoint + '-' + accessPointArn.accountId + outpostsSuffix,
-      serviceName + dualStackSuffix,
+      serviceName + fipsSuffix + dualStackSuffix,
       useArnRegion ? accessPointArn.region : req.service.config.region,
       dnsSuffix
     ].join('.');
@@ -368,9 +377,10 @@ AWS.util.update(AWS.S3.prototype, {
       // should be in the format: "accesspoint/${accesspointName}"
       var serviceName = 's3-object-lambda';
       var accesspointName = accessPointArn.resource.split('/')[1];
+      var fipsSuffix = req.service.config.useFipsEndpoint ? '-fips': '';
       endpoint.hostname = [
         accesspointName + '-' + accessPointArn.accountId,
-        serviceName,
+        serviceName + fipsSuffix,
         useArnRegion ? accessPointArn.region : req.service.config.region,
         dnsSuffix
       ].join('.');
diff --git a/scripts/region-checker/allowlist.js b/scripts/region-checker/allowlist.js
index 3d7a2ffaff..50e3d4b64c 100644
--- a/scripts/region-checker/allowlist.js
+++ b/scripts/region-checker/allowlist.js
@@ -37,17 +37,17 @@ var allowlist = {
     '/services/s3.js': [
         87,
         88,
-        252,
-        254,
-        267,
-        273,
-        629,
-        631,
-        750,
-        761,
-        762,
-        763,
-        768
+        260,
+        262,
+        275,
+        281,
+        639,
+        641,
+        760,
+        771,
+        772,
+        773,
+        778
     ]
 };
 
diff --git a/test/services/s3.spec.js b/test/services/s3.spec.js
index e661d64d67..820f38e07c 100644
--- a/test/services/s3.spec.js
+++ b/test/services/s3.spec.js
@@ -3461,34 +3461,42 @@ describe('AWS.S3', function() {
         });
       });
 
-      it('should correctly generate access point endpoint for pseudo regions', function() {
-        s3 = new AWS.S3({region: 'us-east-1'});
+      it('should correctly generate access point endpoint for s3-external-1', function() {
+        var client = new AWS.S3({region: 'us-east-1'});
         helpers.mockHttpResponse(200, {}, '');
-        var request = s3.getObject({
-          Bucket: 'arn:aws:s3:s3-external-1:123456789012:accesspoint/myendpoint',
-          Key: 'key'
+        var request = client.listObjects({
+          Bucket: 'arn:aws:s3:s3-external-1:123456789012:accesspoint/myendpoint'
         });
         var built = request.build(function() {});
         expect(
           built.httpRequest.endpoint.hostname
         ).to.equal('myendpoint-123456789012.s3-accesspoint.s3-external-1.amazonaws.com');
+      });
 
-        var testFipsError = (s3) => {
-          helpers.mockHttpResponse(200, {}, '');
-          request = s3.getObject({
-            Bucket: 'arn:aws:s3:us-east-1:123456789012:accesspoint/myendpoint',
-            Key: 'key'
-          });
-          var error;
-          request.build(function(err) {
-            error = err;
-          });
-          expect(error.name).to.equal('InvalidConfiguration');
-          expect(error.message).to.equal('ARN endpoint is not compatible with FIPS region');
-        };
-        testFipsError(new AWS.S3({region: 'fips-us-east-1'}));
-        testFipsError(new AWS.S3({region: 'us-east-1-fips'}));
-        testFipsError(new AWS.S3({region: 'us-east-1', useFipsEndpoint: true}));
+      it('should correctly generate access point endpoint when useFipsEndpoint=true', function() {
+        var client = new AWS.S3({region: 'us-west-2', useFipsEndpoint: true});
+        helpers.mockHttpResponse(200, {}, '');
+        var request = client.listObjects({
+          Bucket: 'arn:aws:s3:us-west-2:123456789012:accesspoint/myendpoint'
+        });
+        var built = request.build(function() {});
+        expect(
+          built.httpRequest.endpoint.hostname
+        ).to.equal('myendpoint-123456789012.s3-accesspoint-fips.us-west-2.amazonaws.com');
+      });
+
+      it('should throw when fips region is passed in ARN', function() {
+        var client = new AWS.S3({region: 'us-west-2', useFipsEndpoint: true});
+        helpers.mockHttpResponse(200, {}, '');
+        var request = client.listObjects({
+          Bucket: 'arn:aws:s3:fips-us-west-2:123456789012:accesspoint/myendpoint'
+        });
+        var error;
+        request.build(function(err) {
+          error = err;
+        });
+        expect(error.name).to.equal('InvalidConfiguration');
+        expect(error.message).to.equal('FIPS region not allowed in ARN');
       });
 
       it('should use regions from ARN if s3UseArnRegion config is set to false', function(done) {