Hammer is a surname. Notable people with the surname include:A. J. Hammer, American television and radio personality
Angela Hutchinson Hammer (1870–1952), American newspaper publisher
Anna M. Hammer (1840–1910), American philanthropist and temperance movement leader
Anthony Hammer, Australian actor
Armand Hammer (1898–1990), U.S. physician, entrepreneur, oil magnate and art collector
Armie Hammer, American actor
Barbara Hammer (1939–2019), American film maker
Beatrice Hammer, French writer
Bernhard Hammer (1822–1907), Swiss president
Bob Hammer (1930–2021), American jazz pianist, composer and arranger
Caleb Hammer, American YouTuber
Caroline Hammer (1832–1915), Danish photographer
Cec Hammer (1926–2013), Australian rules footballer
Charles Christian Hammer (1952–2004), American classical guitarist
Christina Hammer, German boxer
Chuck Hammer, American guitarist and composer
Dan Hammer, American software engineer, entrepreneur and environmental economist
Dan Hammer (baseball), American baseball player
Daniela Hammer-Tugendhat (1946–2025), Austrian art historian
Dick Hammer (1930–1999), American Olympic athlete and actor
Doc Hammer, American voice actor, musician, writer and artist
Edward E. Hammer (1931–2012), American engineer who was at the forefront of fluorescent lighting research
Ellen Hammer (1921–2001), American historian
Emanuel Frederick Hammer (1926–2005), American psychologist and author
Emerson Hammer (1856–1940), American politician
Ernest E. L. Hammer (1884–1970), American lawyer, politician, and judge
Ernst Hammer (1884–1957), highly decorated Generalleutnant in the Wehrmacht during World War II
Even Hammer (1732–1800), Norwegian civil servant
Fred Hammer (1930–2020), Luxembourgish sprinter
Frederic E. Hammer (1909–1980), New York politician and judge
Friedrich Julius Hammer (1810–1862), German poet
Graeme Hammer, Australian crop scientist
Heathcote Hammer (1905–1961), Australian World War II general
J. D. Hammer, American baseball player
Jan Hammer, Czech-American musician, composer, and record producer
Jay Hammer, American actor
John Hammer, Australian sports administrator, founder of competitions for older players
Jon Ludvig Hammer, Norwegian chess player
Jørgen Hammer, Norwegian association football player
Joshua Hammer, American journalist
Julie Hammer, Royal Australian Air Force air vice marshal
Kim Hammer, American politician from Arkansas
Kristian Hammer, Norwegian Nordic combined skier
Lance Hammer, American independent filmmaker
Lisa Hammer, American filmmaker, actress, composer and singer
Lukas Hammer, Austrian politician
Marion P. Hammer, American gun rights activist, president of the National Rifle Association
Michael Hammer (disambiguation), multiple peopleMike Hammer (diplomat), in the U.S. State Department
Moshe Hammer, Canadian violinist
Paul Hammer (1900–1978), Luxembourgish sprinter and long jumper
Peter Ladislaw Hammer (1936–2006), Romanian-born American mathematician
Reuven Hammer (1933–2019), American Conservative Jewish rabbi, scholar, author and lecturer
Richard Hammer (1897–1969), German politician
Sarah Hammer, American professional racing cyclist and two-time Olympic silver medalist
Simon Christian Hammer (1866–1932), Norwegian writer and journalist
Victor Hammer (1882–1967), Austrian-born American painter, sculptor, printer and typographer
Will Hammer, pseudonym of William Hinds (1887–1957), American co-founder of Hammer Film Productions
William C. Hammer (1865–1930), U.S. Representative from North Carolina
William H. Hammer, founder Hammer & Co., South Australian photographers
William Joseph Hammer (1858–1934), American electrical engineer and aviator; president of the Edison Pioneers
Zach Hammer, American speed climber
Zevulun Hammer (1936–1998), Israeli politician