As a nickname, Killer or The Killer may refer to:

People known as Killer

• Pietro Aurino (born 1977), Italian former boxer
• Keegan Brown (born 1992), English darts player
• Fred Burke (1893–1940), American armed robber and contract killer
• Clive Caldwell (1910–1994), Australian World War II flying ace
• Doug Gilmour (born 1963), Canadian retired National Hockey League player
• Mack Gray (1905–1981), American actor
• Derek Hales (born 1951), English former footballer
• Kevin Kaminski (born 1969), Canadian former National Hockey League player called "Killer Kaminski"
• Arthur Kane (1949–2004), American bass guitarist for the glam rock band the New York Dolls
• Harmon Killebrew (1936–2011), American Major League Baseball player
• Katlego Mphela (born 1984), footballer

People known as The Killer

• Jesús Chávez (born 1972), Mexican boxer nicknamed "El Matador" ("The Killer")
• Danilo Di Luca (born 1976), professional cyclist nicknamed "The Killer from Spoltore"
• Jerry Lee Lewis (1935–2022), American rock-and-roll and country music singer/pianist
• Christiaan Lindemans (1912–1946), Dutch double agent who worked for both sides in the Second World War, known as "le Tueur" ("the Killer")

See also

• All pages with titles beginning with Killer
• All pages with titles containing Killer
• Killer (disambiguation)
• Christos Dimopoulos (born 1958), Greek retired footballer nicknamed Φονιάς ("Fonias", meaning "Killer")