G-Man (plural G-Men) may refer to:
Law enforcement G-man, short for "Government Man", slang for federal law enforcement agents G-Men, a reference to a detectives of the Dublin Metropolitan Police force's G Division in early 20th-century Ireland
People G. Gordon Liddy (1930–2021), nicknamed G-Man on his radio show. Liddy was an FBI agent at one time earlier in his life Gary Gerould, American sports broadcaster, nicknamed "The G-Man" Gerald McClellan (born 1967), former American boxer nicknamed "G-Man" Monty Sopp (born 1963), professional wrestler known also as "The G-Man" Gez Varley, British techno musician and DJ Fictional and other G-Man (Half-Life), a character in the Half-Life computer game series who is dressed like a government official Goatse man, a man on an internet shock site A slang word for Godzilla Augustus "Gus"/"G-Man" Bachman Turner, a character from the animated television series Robotboy
Other G Men, a 1935 Hollywood crime film G-Man: J. Edgar Hoover and the Making of the American Century, 2022 biography of J. Edgar Hoover by Beverly Gage G-Man (Sonny Rollins album), 1986 G-Man (Rake album), 1996 G-Man (comics), a comic written by Chris Giarrusso G-men (magazine), a monthly Japanese magazine for gay men New York Giants, a National Football League team nicknamed G-Men The Pleazers, a 1960s Australian band originally named G-Men
See also Junior G-Men, an American boys club in the 1930s and 1940s, and related radio program, books, and films that promoted the FBI