Prepare the vegetables: Slice the cucumber, halve the cherry tomatoes, thinly slice the red onion, chop the bell pepper, and set aside.
In a large mixing bowl, combine the cucumber, cherry tomatoes, red onion, bell pepper, Kalamata olives, and feta cheese. Toss gently to mix the ingredients evenly.
In a small bowl or jar, whisk together the dressing ingredients: olive oil, red wine vinegar, minced garlic, dried oregano, salt, and black pepper. Adjust seasoning to taste.
Pour the dressing over the salad and toss gently to coat all the vegetables and feta. Be careful not to break up the feta too much if using cubes.
Let the salad sit for 5-10 minutes to allow the flavors to meld (optional, but recommended).
Transfer to a serving bowl or individual plates. Garnish with fresh parsley or dill if desired. Serve immediately and enjoy your refreshing Greek salad!