Cook the orzo pasta according to package instructions.
Prepare the vegetables: halve the cherry tomatoes, dice the cucumber, and chop the red onion and parsley.
In a large bowl, combine the cooked orzo, halved cherry tomatoes, diced cucumber, chopped red onion, sliced olives, crumbled feta, and chopped parsley.
In a small bowl, whisk together the olive oil, lemon juice, dried oregano, salt, and pepper.
Pour the dressing over the salad mixture and toss gently to combine.
Taste and adjust the seasoning if necessary.
Chill the salad in the refrigerator for at least 30 minutes before serving.