Mortimer is a masculine given name which may refer to:
Mortimer J. Adler (1902–2001), American philosopher, educator and author
Mortimer Caplin (born 1916), American lawyer and educator
Mortimer Cleveland (1883-?), American architect
Mortimer Collins (1827–1876), English poet and novelist
Mortimer Davis (1866–1928), Canadian businessman and philanthropist
Mortimer Durand (1850-1924), British diplomat and civil servant in British India
Mortimer Fitzland Elliott (1839-1920), American politician
Mortimer Hogan (1862–1923), American Major League Baseball outfielder
Mortimer von Kessel (1893-1981), German World War II general
Mort Leav (1916-2005), American comic book and advertising artist
Mortimer Dormer Leggett (1821–1896), American lawyer, school administrator, professor and Union Army major general during the American Civil War
Mortimer Lewis (1796–1879), English architect and surveyor; Colonial Architect in New South Wales
Mortimer von Maltzan (1793-1843), Prussian diplomat and Foreign Minister
Mortimer Menpes (1855–1938), Australian-born artist, author, printmaker and illustrator
Mortimer M. Miller (1929-2017), American politician and writer
Mortimer Mishkin (born 1926), American neuropsychologist
Mortimer L. Neinken (1896–1984), American stamp collector
Mortimer Planno (1929-2006), drummer and Rastafari elder best known as the Rasta teacher of Bob Marley
Mortimer R. Proctor (1889-1968), American politician, 66th governor of Vermont
Mortimer Sackler (1916–2010), American physician, entrepreneur and philanthropist
Mortimer L. Schiff (1877-1931), American banker and Boy Scouts of America leader
Mortimer Singer (1863–1929), Anglo-American landowner, philanthropist, sportsman and early pilot
Mortimer Thomson (1832–1875), American journalist and humorist
Mort Weisinger (1915-1978), American magazine and comic book editor
Mortimer Wheeler (1890-1976), British archaeologist
Mortimer Wilson (1876–1932), American composer of classical music
Mortimer Zuckerman (born 1937), Canadian-born American businessman
