In a large mixing bowl, combine the diced cucumbers, cherry tomatoes, red bell pepper, red onion, feta cheese, Kalamata olives, and parsley.

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 salad mixture and gently toss to combine, ensuring all ingredients are well coated.

Let the salad sit for at least 15 minutes before serving to allow the flavors to meld.

Serve chilled or at room temperature.