Cook the rotini pasta according to package instructions until al dente. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooled pasta, cherry tomatoes, cucumber, red bell pepper, black olives, salami, pepperoni, mozzarella cheese, and red onion.
In a small bowl, whisk together the Italian dressing, dried oregano, salt, and pepper.
Pour the dressing over the pasta salad and toss gently to combine all ingredients evenly.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Serve chilled, and enjoy!