In a small bowl, whisk together olive oil, red wine vinegar, minced garlic, lemon zest, lemon juice, oregano, salt, and black pepper until well combined.
Bring 4 quarts of water and 1 tablespoon salt to a rolling boil in a large pot.
Add the rotini pasta and cook according to package directions, about 7 to 10 minutes, until al dente.
Drain the pasta thoroughly and rinse under cold water to stop the cooking process.
In a large mixing bowl, combine the cooled pasta, cucumber, bell pepper, red onion, grape tomatoes, feta cheese, and olives.
Pour the prepared dressing over the salad.
Season with additional salt and pepper to taste.
Gently toss everything together until evenly coated.
Serve immediately or chill for 30 minutes before serving for even better flavor. This Easy Greek Pasta Salad tastes even better after the ingredients have had time to mingle.