Bring a large pot of salted water to a boil. Add the rigatoni pasta and cook according to package instructions until al dente, about 10-12 minutes.
Once cooked, drain the pasta in a colander and rinse it under cold water to stop further cooking.
In a large mixing bowl, crumble the feta cheese into small pieces. Measure out the dried cranberries and finely chop the red onion before adding them to the bowl along with the crumbled feta.
In a separate small bowl, whisk together olive oil, lemon juice, honey, Dijon mustard, salt, and black pepper until well combined.