Dan Callahan is an American actor and writer whose exact birthday and birthplace are not publicly available in major sources. He has been active since 2002, accumulating over 16 film credits, and also works as a screenwriter.

His most notable film credits include C.J. in The Mothman Prophecies (2002, starring Richard Gere), "Jack" in Spider-Man 2 (2004, with Tobey Maguire), Dr. Hendricks in Madhouse (2004, with Joshua Leonard), a role in Undiscovered (2005), TV Store Guy in Crank (2006, with Jason Statham), Storage Customer in The Dead Girl (2006, with Brittany Murphy), Jazz Club Musician in Spider-Man 3 (2007), Chip Bentwood in Pathology (2008, with Milo Ventimiglia), Trey Restom in Untraceable (2008, with Diane Lane), Hospital Young Doctor in Henry Poole Is Here (2008, with Luke Wilson), Troy Taleveski in The Midnight Meat Train (2008, with Bradley Cooper), Rick in The Ugly Truth (2009, with Katherine Heigl and Gerard Butler), Paramedic in Crank: High Voltage (2009, with Jason Statham), Backup Geek in Gamer (2009, with Gerard Butler), Jesse in The Anniversary (2009), Young Producer in Walk of Shame (2014, with Elizabeth Banks), and Webber Agent #2 in A-X-L (2018). He also wrote the screenplays for College (2008) and Demoted (2011).