diff --git a/backend/common.go b/backend/common.go
index 01dfd40a..de8d7efd 100644
--- a/backend/common.go
+++ b/backend/common.go
@@ -643,6 +643,7 @@ type PreConditions struct {
 // - if-modified-since
 // - if-unmodified-since
 // if-match and if-none-match are ETag comparisons
+// if-match "*" matches any ETag, and if-none-match "*" matches no ETag
 // if-modified-since and if-unmodified-since are last modifed time comparisons
 func EvaluatePreconditions(etag string, modTime time.Time, preconditions PreConditions) error {
 	if preconditions.IfMatch == nil && preconditions.IfNoneMatch == nil && preconditions.IfModSince == nil && preconditions.IfUnmodeSince == nil {
@@ -654,10 +655,10 @@ func EvaluatePreconditions(etag string, modTime time.Time, preconditions PreCond
 	// convert all conditions to *bool to evaluate the conditions
 	var ifMatch, ifNoneMatch, ifModSince, ifUnmodeSince *bool
 	if preconditions.IfMatch != nil {
-		ifMatch = getBoolPtr(*preconditions.IfMatch == etag)
+		ifMatch = getBoolPtr(*preconditions.IfMatch == "*" || *preconditions.IfMatch == etag)
 	}
 	if preconditions.IfNoneMatch != nil {
-		ifNoneMatch = getBoolPtr(*preconditions.IfNoneMatch != etag)
+		ifNoneMatch = getBoolPtr(*preconditions.IfNoneMatch != "*" && *preconditions.IfNoneMatch != etag)
 	}
 	if preconditions.IfModSince != nil {
 		ifModSince = getBoolPtr(preconditions.IfModSince.UTC().Before(modTime.UTC()))
diff --git a/tests/integration/CopyObject.go b/tests/integration/CopyObject.go
index 90b781a7..63d09bac 100644
--- a/tests/integration/CopyObject.go
+++ b/tests/integration/CopyObject.go
@@ -1208,6 +1208,19 @@ func CopyObject_conditional_reads(s *S3Conf) error {
 			{nil, &etagTrimmed, nil, &before, errCond},
 			{nil, &etagTrimmed, nil, &after, errMod},
 			{nil, &etagTrimmed, nil, nil, errMod},
+
+			// if-match and if-none-match with asterisk
+			{getPtr("*"), nil, nil, nil, nil},
+			{getPtr("*"), nil, &after, nil, errMod},
+			{getPtr("*"), getPtr("invalid_etag"), nil, nil, nil},
+			{getPtr("*"), etag, nil, nil, errMod},
+			{getPtr("*"), getPtr("*"), nil, nil, errMod},
+			{getPtr("*"), getPtr("*"), nil, &before, errMod},
+			{nil, getPtr("*"), nil, nil, errMod},
+			{nil, getPtr("*"), &before, nil, errMod},
+			{nil, getPtr("*"), nil, &after, errMod},
+			{nil, getPtr("*"), nil, &before, errCond},
+			{getPtr("invalid_etag"), getPtr("*"), nil, nil, errCond},
 		} {
 			ctx, cancel := context.WithTimeout(context.Background(), shortTimeout)
 			_, err := s3client.CopyObject(ctx, &s3.CopyObjectInput{
diff --git a/tests/integration/GetObject.go b/tests/integration/GetObject.go
index 3a3ca7c0..fb15b633 100644
--- a/tests/integration/GetObject.go
+++ b/tests/integration/GetObject.go
@@ -539,6 +539,19 @@ func GetObject_conditional_reads(s *S3Conf) error {
 			{nil, &etagTrimmed, nil, &before, errCond},
 			{nil, &etagTrimmed, nil, &after, errMod},
 			{nil, &etagTrimmed, nil, nil, errMod},
+
+			// if-match and if-none-match with asterisk
+			{getPtr("*"), nil, nil, nil, nil},
+			{getPtr("*"), nil, &after, nil, errMod},
+			{getPtr("*"), getPtr("invalid_etag"), nil, nil, nil},
+			{getPtr("*"), etag, nil, nil, errMod},
+			{getPtr("*"), getPtr("*"), nil, nil, errMod},
+			{getPtr("*"), getPtr("*"), nil, &before, errMod},
+			{nil, getPtr("*"), nil, nil, errMod},
+			{nil, getPtr("*"), &before, nil, errMod},
+			{nil, getPtr("*"), nil, &after, errMod},
+			{nil, getPtr("*"), nil, &before, errCond},
+			{getPtr("invalid_etag"), getPtr("*"), nil, nil, errCond},
 		} {
 			ctx, cancel := context.WithTimeout(context.Background(), shortTimeout)
 			_, err := s3client.GetObject(ctx, &s3.GetObjectInput{
diff --git a/tests/integration/HeadObject.go b/tests/integration/HeadObject.go
index 6fa68af4..0f5ca82d 100644
--- a/tests/integration/HeadObject.go
+++ b/tests/integration/HeadObject.go
@@ -534,6 +534,19 @@ func HeadObject_conditional_reads(s *S3Conf) error {
 			{nil, &etagTrimmed, nil, &before, errCond},
 			{nil, &etagTrimmed, nil, &after, errMod},
 			{nil, &etagTrimmed, nil, nil, errMod},
+
+			// if-match and if-none-match with asterisk
+			{getPtr("*"), nil, nil, nil, nil},
+			{getPtr("*"), nil, &after, nil, errMod},
+			{getPtr("*"), getPtr("invalid_etag"), nil, nil, nil},
+			{getPtr("*"), etag, nil, nil, errMod},
+			{getPtr("*"), getPtr("*"), nil, nil, errMod},
+			{getPtr("*"), getPtr("*"), nil, &before, errMod},
+			{nil, getPtr("*"), nil, nil, errMod},
+			{nil, getPtr("*"), &before, nil, errMod},
+			{nil, getPtr("*"), nil, &after, errMod},
+			{nil, getPtr("*"), nil, &before, errCond},
+			{getPtr("invalid_etag"), getPtr("*"), nil, nil, errCond},
 		} {
 			ctx, cancel := context.WithTimeout(context.Background(), shortTimeout)
 			_, err := s3client.HeadObject(ctx, &s3.HeadObjectInput{
diff --git a/tests/integration/UploadPartCopy.go b/tests/integration/UploadPartCopy.go
index 3e405fa8..677c0b36 100644
--- a/tests/integration/UploadPartCopy.go
+++ b/tests/integration/UploadPartCopy.go
@@ -804,6 +804,19 @@ func UploadPartCopy_conditional_reads(s *S3Conf) error {
 			{nil, &etagTrimmed, nil, &before, errCond},
 			{nil, &etagTrimmed, nil, &after, errMod},
 			{nil, &etagTrimmed, nil, nil, errMod},
+
+			// if-match and if-none-match with asterisk
+			{getPtr("*"), nil, nil, nil, nil},
+			{getPtr("*"), nil, &after, nil, errMod},
+			{getPtr("*"), getPtr("invalid_etag"), nil, nil, nil},
+			{getPtr("*"), etag, nil, nil, errMod},
+			{getPtr("*"), getPtr("*"), nil, nil, errMod},
+			{getPtr("*"), getPtr("*"), nil, &before, errMod},
+			{nil, getPtr("*"), nil, nil, errMod},
+			{nil, getPtr("*"), &before, nil, errMod},
+			{nil, getPtr("*"), nil, &after, errMod},
+			{nil, getPtr("*"), nil, &before, errCond},
+			{getPtr("invalid_etag"), getPtr("*"), nil, nil, errCond},
 		} {
 			mpKey := "mp-key"
 			mp, err := createMp(s3client, bucket, mpKey)