Prepare the couscous by adding it to a bowl and pouring boiling water over it.
While the couscous is resting, chop the vegetables and herbs.
In a separate bowl, combine the olive oil, lemon juice, oregano, salt, and pepper to make the dressing.
After the couscous has rested, fluff it with a fork and add it to a large mixing bowl.
Add the chopped tomatoes, cucumber, red onion, olives, feta, and parsley to the couscous.
Pour the dressing over the salad and toss everything together until well combined.
Taste and adjust seasoning as necessary before serving.
Serve the salad chilled or at room temperature.
