Cook the elbow macaroni according to package instructions until al dente. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the drained tuna, cherry tomatoes, cucumber, and red onion.
In a separate bowl, mix together the Greek yogurt, mayonnaise, lemon juice, garlic powder, dried dill, salt, and pepper until smooth.
Add the cooled macaroni to the bowl with the tuna and vegetables. Pour the dressing over the top and gently toss everything together until well combined.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Serve chilled and enjoy!