* Defining "starred": What constitutes a "starring" role can be subjective. Does it include cameos or voice-over roles?
* Ongoing career: Ferrell continues to act in films, so the number is constantly changing.
* Different sources: Different websites and databases might list slightly different numbers.
However, according to IMDb, Will Ferrell has appeared in over 80 films. This number likely includes a mix of starring roles, supporting roles, and smaller appearances.