Cook the orzo according to package instructions until al dente, then drain and cool.
In a large mixing bowl, combine the cooled orzo with cherry tomatoes, cucumber, red onion, olives, and feta cheese.
In a small bowl, whisk together olive oil, red wine vinegar, oregano, salt, and pepper.
Pour the dressing over the orzo salad and toss to combine evenly.
Let the salad sit in the refrigerator for at least 30 minutes before serving.
Taste and adjust seasoning if necessary before serving.