diff --git a/unreserved.go b/unreserved.go
new file mode 100644
index 0000000..98f9be6
--- /dev/null
+++ b/unreserved.go
@@ -0,0 +1,25 @@
+package rfc3986
+
+import (
+	"sourcecode.social/reiver/go-rfc2234"
+)
+
+// IsUnreserved returns true if the value of 'r' matches 'unreserved' as defined in IETF RFC-3986:
+//
+//	unreserved  = ALPHA / DIGIT / "-" / "." / "_" / "~"
+func IsUnreserved(r rune) bool {
+	if rfc2234.IsAlpha(r) {
+		return true
+	}
+
+	if rfc2234.IsDigit(r) {
+		return true
+	}
+
+	switch r {
+	case                          '-' , '.' , '_' , '~':
+		return true
+	}
+
+	return false
+}
diff --git a/unreserved_test.go b/unreserved_test.go
new file mode 100644
index 0000000..5e7fae8
--- /dev/null
+++ b/unreserved_test.go
@@ -0,0 +1,52 @@
+package rfc3986_test
+
+import (
+	"testing"
+
+	"sourcecode.social/reiver/go-rfc2234"
+
+	"sourcecode.social/reiver/go-rfc3986"
+)
+
+func TestIsUnreserved(t *testing.T) {
+
+	tests := []struct{
+		Rune rune
+		Expected bool
+	}{
+	}
+
+	for r:=rune(0); r < rune(8192); r++ {
+		test := struct{
+			Rune rune
+			Expected bool
+		}{
+			Rune: r,
+			Expected: false,
+		}
+
+		if rfc2234.IsAlpha(r) ||
+		   rfc2234.IsDigit(r) ||
+		   '-' == r           ||
+		   '.' == r           ||
+		   '_' == r           ||
+		   '~' == r           {
+			test.Expected = true
+		}
+
+		tests = append(tests, test)
+	}
+
+	for testNumber, test := range tests {
+		actual := rfc3986.IsUnreserved(test.Rune)
+		expected := test.Expected
+
+		if expected != actual {
+			t.Errorf("For test #%d, the actual value for rfc3986.Unreserved() is not what was expected.", testNumber)
+			t.Logf("EXPECTED: %t", expected)
+			t.Logf("ACTUAL:   %t", actual)
+			t.Logf("RUNE: (%U) %q", test.Rune, string(test.Rune))
+			continue
+		}
+	}
+}