Boil water in a large pot and add a pinch of salt.
Add the orzo pasta to the boiling water and cook according to package instructions.
While the orzo cooks, prepare the vegetables: chop the tomatoes, cucumber, bell pepper, and onion.
In a large bowl, combine the chopped vegetables with olives and parsley.
Once the orzo is cooked, drain it and rinse under cold water to cool.
Add the cooled orzo to the vegetable mixture.
In a separate bowl, whisk together olive oil, red wine vinegar, oregano, salt, and pepper.
Pour the dressing over the orzo salad and toss gently to combine.
Crumble feta cheese over the salad and fold it in carefully.
Chill in the refrigerator for 30 minutes before serving.