Alonzo is both a given name and a Spanish surname. Notable people with the name include:

• Alonzo de Barcena, 16th-century Spanish Jesuit missionary and linguist
• Alonzo de Santa Cruz (c. 1505–1567), Spanish cartographer, mapmaker, instrument maker, historian and teacher
• Alonzo Addae (born 1997), Canadian football player
• Alonzo Babers (b. 1961), American sprinter
• Alonzo L. Best (1854–1923), American politician
• Alonzo Bodden, American comedian
• Alonzo Church (1903–1995), American mathematician and computer scientist
• Alonzo Clemons, American autistic savant clay sculptor
• Alonzo B. Coons (1841–1914), American lawyer and politician
• Alonzo B. Cornell (1832–1904), a governor of New York
• Alonzo Drake (1884–1919), English footballer and cricketer
• Alonzo J. Edgerton (1827–1896), American politician
• Alonzo Dillard Folger (1888–1941), American politician
• Alonzo Gee, American basketball player
• Alonzo A. Hinckley (1870–1936), American official of the Church of Jesus Christ of Latter-day Saints
• Alonzo Horton (1813–1910), developer of San Diego, California
• Alonzo Lawrence (b. 1989), American football player
• Alonzo C. Mather (1848–1941), founder of the Mather Stock Car Company
• Alonzo J. Mathison (1876–1941), American politician
• Alonzo B. May (1906–1968), American economist
• Alonzo Mourning (b. 1970), American basketball player
• Alonzo W. Pond (1894–1986), American archaeologist and speleogist
• Alonzo Sargent, (fl. 1918), American locomotive engineer
• Alonzo Swales (1870–1952), British trade unionist
• Allonzo Trier (born 1996), American basketball player
• Alonzo Muhlach, Filipino actor
• Alonzo Williams (born 1957), American DJ
• Alonzo Williams (born 1963), American football player

• Anne-Marie Alonzo (1951–2005), Canadian playwright, poet, novelist, critic and publisher
• Bea Alonzo (born 1987), Filipino actress and model
• Chad Alonzo, Filipino basketball player
• Chinggoy Alonzo (1950–2017), Filipino actor
• Jérôme Alonzo (born 1972), French football (soccer) player
• John A. Alonzo (1934–2001), U.S. cinematographer
• Mariano Roque Alonzo (died 1853), President of Provisional Junta of Paraguay from 9 February 1841 to 14 March 1841
• Pierre Alonzo (footballer) (born 1940), former French football player

• Alonzo Quixano, the protagonist of the novel Don Quixote de la Mancha by Miguel de Cervantes
• Alonzo, from Disney's 101 Dalmatians
• Mr Alonzo Smith, played by Leon Ames, and Alonzo 'Lon' Smith Jr., played by Henry H. Daniels Jr., from Meet Me in St. Louis (1944)
• Alonzo (cat), in T. S. Eliot's poetry and the musical CATS
• Alonzo Todd, cousin of Peter Todd in the Billy Bunter books
• Pierre Alonzo, a pseudonym of Richard E. Hughes

• Alonso
• Alfonso
• Lonzo

Name list

This page or section lists people that share the same given name or the same family name.
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