Bring a large pot of salted water to a boil.
Add the rotini pasta and cook according to package instructions until al dente.
Drain the pasta and rinse under cold water to stop cooking.
In a large bowl, combine the cooked pasta, cherry tomatoes, cucumber, olives, and red onion.
In a small bowl, whisk together olive oil, red wine vinegar, oregano, salt, and pepper.
Pour the dressing over the pasta salad and toss to combine.
Gently fold in the crumbled feta cheese.
Adjust seasoning as needed, adding more salt and pepper if desired.
Chill the salad in the refrigerator for at least 30 minutes before serving.
Serve cold and enjoy the refreshing flavors!