In a small mixing bowl, combine Greek yogurt, olive oil, lemon juice, minced garlic, salt, and pepper. Whisk together until smooth and creamy. Set aside.

Slice cucumbers in half lengthwise and cut into 3mm thick half-moon slices. Finely slice red onion.

In a large salad bowl, combine sliced cucumbers, red onion, and chopped dill. Toss gently to mix.

Pour the dressing over the salad mixture. Toss gently until all ingredients are well-coated.

Serve immediately or refrigerate for up to 1 day before serving.