Cook the whole wheat pasta according to package instructions until al dente. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooled pasta, diced cucumber, cherry tomatoes, bell pepper, red onion, parsley, and feta cheese if using.
In a small bowl, whisk together the olive oil, red wine vinegar, dried oregano, salt, and pepper until well combined.
Pour the dressing over the pasta salad and toss gently to combine all ingredients.
Chill the salad in the refrigerator for at least 30 minutes before serving to allow the flavors to meld.
Serve cold and enjoy!