Joseph Francis Mazzello III (born September 21, 1983 in Rhinebeck, New York) is an American actor.
He's perhaps best-known for his role as Tim Murphy in Jurassic Park when he was a child. As an adult, he's largely known for his roles in The Pacific, The Social Network, Justified, and Bohemian Rhapsody.
- Radio Flyer (1992) - Bobby
- Jurassic Park (1993) - Tim Murphy
- The Lost World: Jurassic Park (1997) (cameo)
- The River Wild (1994) - Roarke Hartman
- Star Kid (1997) - Spencer Griffith
- Wooly Boys (2001) - Charles
- The Social Network (2010) - Dustin Moskovitz
- G.I. Joe: Retaliation (2013) - Mouse
- Undrafted (2016) - Pat Murray (also writer and director)
- Bohemian Rhapsody (2018) - John Deacon
- The Pacific (2010) - Eugene Sledge
- Justified (2013) - Billy St. Cyr
- Person of Interest (2014) - Daniel Casey