diff --git a/dn_test.go b/dn_test.go
index ee181310..d93ba650 100644
--- a/dn_test.go
+++ b/dn_test.go
@@ -171,6 +171,50 @@ func TestDNEqual(t *testing.T) {
 	}
 }
 
+func TestDNEqualFold(t *testing.T) {
+	testcases := []struct {
+		A     string
+		B     string
+		Equal bool
+	}{
+		// Match on case insensitive
+		{"o=A", "o=a", true},
+		{"o=A,o=b", "o=a,o=B", true},
+		{"o=a+o=B", "o=A+o=b", true},
+		{
+			"cn=users,ou=example,dc=com",
+			"cn=Users,ou=example,dc=com",
+			true,
+		},
+
+		// Match on case insensitive and case mismatch in type
+		{"o=A", "O=a", true},
+		{"o=A,o=b", "o=a,O=B", true},
+		{"o=a+o=B", "o=A+O=b", true},
+	}
+
+	for i, tc := range testcases {
+		a, err := ParseDN(tc.A)
+		if err != nil {
+			t.Errorf("%d: %v", i, err)
+			continue
+		}
+		b, err := ParseDN(tc.B)
+		if err != nil {
+			t.Errorf("%d: %v", i, err)
+			continue
+		}
+		if expected, actual := tc.Equal, a.EqualFold(b); expected != actual {
+			t.Errorf("%d: when comparing '%s' and '%s' expected %v, got %v", i, tc.A, tc.B, expected, actual)
+			continue
+		}
+		if expected, actual := tc.Equal, b.EqualFold(a); expected != actual {
+			t.Errorf("%d: when comparing '%s' and '%s' expected %v, got %v", i, tc.A, tc.B, expected, actual)
+			continue
+		}
+	}
+}
+
 func TestDNAncestor(t *testing.T) {
 	testcases := []struct {
 		A        string
diff --git a/v3/dn_test.go b/v3/dn_test.go
index ee181310..d93ba650 100644
--- a/v3/dn_test.go
+++ b/v3/dn_test.go
@@ -171,6 +171,50 @@ func TestDNEqual(t *testing.T) {
 	}
 }
 
+func TestDNEqualFold(t *testing.T) {
+	testcases := []struct {
+		A     string
+		B     string
+		Equal bool
+	}{
+		// Match on case insensitive
+		{"o=A", "o=a", true},
+		{"o=A,o=b", "o=a,o=B", true},
+		{"o=a+o=B", "o=A+o=b", true},
+		{
+			"cn=users,ou=example,dc=com",
+			"cn=Users,ou=example,dc=com",
+			true,
+		},
+
+		// Match on case insensitive and case mismatch in type
+		{"o=A", "O=a", true},
+		{"o=A,o=b", "o=a,O=B", true},
+		{"o=a+o=B", "o=A+O=b", true},
+	}
+
+	for i, tc := range testcases {
+		a, err := ParseDN(tc.A)
+		if err != nil {
+			t.Errorf("%d: %v", i, err)
+			continue
+		}
+		b, err := ParseDN(tc.B)
+		if err != nil {
+			t.Errorf("%d: %v", i, err)
+			continue
+		}
+		if expected, actual := tc.Equal, a.EqualFold(b); expected != actual {
+			t.Errorf("%d: when comparing '%s' and '%s' expected %v, got %v", i, tc.A, tc.B, expected, actual)
+			continue
+		}
+		if expected, actual := tc.Equal, b.EqualFold(a); expected != actual {
+			t.Errorf("%d: when comparing '%s' and '%s' expected %v, got %v", i, tc.A, tc.B, expected, actual)
+			continue
+		}
+	}
+}
+
 func TestDNAncestor(t *testing.T) {
 	testcases := []struct {
 		A        string