Cook orzo pasta according to package directions (approximately 8 minutes) until al dente. Drain and let cool completely.
In a large bowl, combine the cooled orzo, halved tomatoes, chopped green onions, bell pepper, parsley, dill, sliced olives, and capers.
In a separate small bowl, whisk together lemon juice, lemon zest, olive oil, minced garlic, oregano, salt, and black pepper until well combined.
Pour the dressing over the orzo mixture and toss thoroughly to coat all ingredients.
Top with crumbled feta cheese and refrigerate for at least 30 minutes before serving to allow flavors to meld.