Rob Lanza (also credited as Robert Lanza) is an American character actor, active since the late 1990s. He is best known for his small but memorable roles as the Man in Suit in David Fincher's Fight Club (1999) and the New Year's Eve M.C. in Rumor Has It... (2005, with Jennifer Aniston and Kevin Costner). He has appeared in over a dozen productions across film and television since 1999, primarily in supporting and background roles.

His filmography includes Opie Gets Laid (2005, as Third Guy), Out of the Way (2006, as Jack), Amhurst (2008, as Liam Barnes), Finding Red Cloud (2008, as Moira's Co-Worker), Love on a Leash (2011, as Frank), Midlife (2015, as Bar Patron), Rose Garden (2016, as Mr. Turner), Taste (2019, as Mr. Henderson), Ass Clowns: Constipated (2021, as Ahmed), Gift Wrapped (2023, as Attorney Al Rosenberg), Jim Shoe (2023, as Corey Ander), and The Made Man (2023, as Monte). On television he appeared as Skinny Man in Nip/Tuck (2008) and in Angel (2000). He is also in post-production on Broken/Together (as Auguste Stanton).