Bring a pot of salted water to a boil.
Add the rotini pasta and cook according to package instructions until al dente.
Drain the pasta and rinse under cold water to cool.
In a large bowl, combine the drained tuna, cherry tomatoes, black olives, red onion, cucumber, and parsley.
Add the cooled pasta to the bowl.
In a separate small bowl, whisk together the olive oil, lemon juice, salt, and pepper.
Pour the dressing over the pasta salad and toss to combine.
Taste and adjust seasoning if necessary.
Chill in the refrigerator for at least 30 minutes before serving.
Serve cold and enjoy!