- In a large mixing bowl, combine the diced tomatoes, cucumber, red onion, feta cheese, parsley, and Kalamata olives. 
- 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 vegetable mixture and gently toss until everything is evenly coated. 
- Let the salsa sit for at least 15 minutes at room temperature to allow the flavors to meld. 
- Serve chilled or at room temperature with pita chips, grilled meats, or as a topping for salads.