Cook the Orzo:
Bring a large pot of salted water to a boil. Add the orzo and cook according to package instructions (about 8–10 minutes) until al dente. Drain and rinse with cold water to cool.
Prepare the Dressing:
In a small bowl, whisk together olive oil, lemon juice, Dijon mustard, minced garlic, dried oregano, salt, and pepper. Set aside.
Chop the Vegetables:
While the orzo cools, chop the tomatoes, cucumber, bell pepper, red onion, and olives.
Assemble the Salad:
In a large mixing bowl, combine the cooked orzo, vegetables, feta cheese, parsley, and dill.
Add the Dressing:
Pour the dressing over the salad and toss gently to combine. Taste and adjust seasoning if needed.
Chill and Serve:
Refrigerate the salad for at least 30 minutes to let the flavors meld. Serve cold or at room temperature.