Step 1 of 5
Combine cucumbers, tomatoes, onion, and olives in a large bowl.
Step 2 of 5
In a small bowl, whisk together olive oil, vinegar, oregano, salt, and pepper.
Step 3 of 5
Pour dressing over vegetables and toss gently.
Step 4 of 5
Top with feta cheese cubes.
Step 5 of 5
Let sit for 10 minutes before serving to allow flavors to meld.