Cook the Pasta: Bring a large pot of generously salted water to a boil. Add the orzo pasta and cook for 8 to 9 minutes, or until just al dente.
Cool the Pasta: Drain the orzo in a fine-mesh colander and immediately rinse with cold running water to stop the cooking process and remove excess starch. Let drain completely.
Prepare the Dressing: In a small bowl or mason jar, combine the extra virgin olive oil, fresh lemon juice, minced garlic, dried oregano, salt, and black pepper. Whisk vigorously or shake until completely emulsified.
Assemble: In a large mixing bowl, combine the thoroughly cooled orzo, diced cucumber, halved cherry tomatoes, diced red onion, sliced Kalamata olives, and chopped parsley.
Dress: Pour the lemon vinaigrette over the salad and toss well to ensure everything is evenly coated.
Add Feta: Gently fold in the crumbled feta cheese right at the end to keep the chunks intact.
Serve or Store: Serve immediately, or cover and refrigerate for up to 1 hour before serving to let the flavors deepen.