David Della Rocco is an Italian-American comedian and classically trained actor best known for his major role in the 1999 cult film The Boondock Saints, in which he played a character also named David Della Rocco opposite Sean Patrick Flanery and Norman Reedus.

David Della Rocco is a friend of The Boondock Saints writer and director Troy Duffy and his role in that movie was written specifically for him. He played the part of a lowlife in the mob who helps his two friends, the MacManus brothers, in ridding Boston of criminals and evil. Della Rocco brought many of his real-life mannerisms and flair to the character, making an impression on fans and living up to the character's nickname, "The Funnyman."

David Della Rocco returns as Rocco in the sequel The Boondock Saints II: All Saints Day in a dream sequence guiding the MacManus brothers on their mission.

David Della Rocco also plays "Wheels" in Jake's Corner written and directed by Jeff Santo which also stars Richard Tyson and Diane Ladd. In this film Della Rocco plays a truck driving grill man who speaks in tongues.

He is a native of Norwich, Connecticut, and studied acting with the late Susan Peretz in Los Angeles and is also a member of The Actor's Studio. He has appeared in numerous stage plays such as Glengarry Glen Ross at the Third Street Theatre and Freedom Frogs at the Lee Strasberg Theatre.