Alphonso or Alfonso is a masculine given name and occasional nickname which may refer to:

Aristocrats

Iberia

• Alfonso I of Aragon (1104–1134), known as (The Battler)

• Alfonso I of Asturias (739–757)

• Alfonso II of Aragon (1162–1196)

• Alfonso II of Asturias (791–842)

• Alfonso II of Naples (1448–1495)

• Alfonso III of Aragon (1285–1291)

• Alfonso III of León (866–910)

• Alfonso IV of Aragon (1327–1336)

• Alfonso IV of León (925–931)

• Alfonso V of Aragon (1416–1458), also king of Naples and Sicily

• Alfonso V of León (999–1028)

• Alfonso VI of León (1065–1109)

• Alfonso VII of León (1126–1157)

• Alfonso VIII of Castile (1158–1214)

• Alfonso IX of León (1188–1230)

• Alfonso X of Castile (1252–1284)

• Alfonso XI of Castile (1312–1350)

• Alfonso XII of Spain (1857–1885) (ordinal numbering continues from the kings of Castile)

• Alfonso XIII of Spain (1886–1931)

• Alfonso Fróilaz, briefly king of the unified kingdom of Asturias, Galicia and León in 925

• Alfonso, Prince of Asturias (1453–1468), figurehead of rebelling magnates against his brother King Henry IV of Castile

• Infante Alfonso of Spain (1941–1956), younger brother of King Juan Carlos of Spain

• Alfonso of Spain, Prince of Asturias, heir apparent of the throne of Spain

Elsewhere

• Alfonso I d'Este (1476–1534), Duke of Ferrara

• Alfonso II d'Este (1533–1597), Duke of Ferrara

• Alfonso II, Count of Provence (1180–1209), second son of Alfonso II of Aragon

• Alfonso III d'Este (1591–1644), Duke of Modena and Reggio

• Alfonso of Capua (c. 1120 – 1144), Prince of Capua

• Prince Alfonso, Count of Caserta (1841–1934), Duke of Calabria and head of the royal house of the Two Sicilies

• Prince Alfonso of Hohenlohe-Langenburg (1924–2003), Spanish playboy and businessman

• Alfonso Jordan (1103–1148), Count of Tripoli, Count of Rouergue, Count of Toulouse, Margrave of Provence and Duke of Narbonne

• Infante Alfonso, Duke of Calabria (1901–1964), claimant to the title of the head of the House of Bourbon-Two Sicilies

• Alphonso, Earl of Chester (1273–1284), first son of Edward I of England, heir apparent to the English throne

• Prince Alfonso of Liechtenstein (born 2001), grandson of Hans-Adam II

Others

• Alfonso of Valladolid (c. 1270 – c. 1347), Jewish convert to Christianity, philosopher, and mathematician

• Alphonso Calhoun Avery (1835–1913), American lawyer, Confederate military officer, and politician

• Alphonso Boone (1796–1850), American pioneer in what is now Oregon

• Alfonso Calderon (activist) (born 2001), Spanish-born American gun control activist

• Alfonso Calderón (poet) (1930–2009), Chilean poet and writer

• Al Campbell (born 1954), Jamaican reggae singer

• Alphonso Carreker (born 1962), American former National Football League player

• Alfonso Cuarón (born 1961), Mexican cinematographer

• Alphonso Giovanni Giuseppe Roberto D'Abruzzo, birth name of Robert Alda (1914–1986), American actor

• Alphonso Joseph D'Abruzzo, birth name of Alan Alda (born 1936), American actor, son of Robert Alda

• Alphonso Davies (born 2000), Ghanaian-born Canadian soccer player

• Mike Espy (born 1953), American lawyer and politician

• Alphonso Ford (1971–2004), American basketball player

• Alphonso Gerard (1916–2002), American Negro league baseball player

• Alphonso Jackson (born 1945), American politician, United States Secretary of Housing and Urban Development

• Alphonso Johnson (born 1951), American jazz bassist

• Buck Johnson (born 1964), American former basketball player

• Alfonso Lizarazo (born 1940), Colombian host and politician

• Alphonso Lingis (1933–2025), American philosopher, writer, and translator

• Alphonso Lisk-Carew (1883–1969), Sierra Leonean photographer

• Alphonso M. Lunt (1837–1917), Union Army sergeant awarded the Medal of Honor

• Alphonso McAuley, 21st century American actor

• Alfonso Mejia-Arias (born 1961), Mexican musician, writer, social activist, and politician

• Alfonso Oiterong, Palauan politician, vice president

• Alfonso Pérez (born 1972), Spanish former footballer

• Alfonso Pérez (boxer) (born 1949), Colombian former boxer

• Alfonso Quiñónez Molina (1874–1950), Salvadoran politician, physician, and president (1913–1914, 1918–1919, 1923–1927)

• Alfonso Ribeiro (born 1971), American actor and game show host

• Alphonso Theodore Roberts (1937–1996), Vincentian political activist and cricketer

• Alfonso John Romero (born 1967), American video game designer

• Alphonso Sgroia (1886–1940), New York City gangster and murderer

• Alphonso Smith (born 1985), American former National Football League player

• Alphonso C. Smith (1894–1945), Canadian politician

• C. Alphonso Smith (1864–1924), American English professor, college dean, philologist, and folklorist

• Alfonso Soriano (born 1976), American Major League Baseball player

• Alphonso Sumner, African American newspaper publisher and abolitionist who opened the first Black school in Nashville, Tennessee in 1833

• Alphonso Taft (1810–1891), American jurist, diplomat, and politician, United States Attorney General and Secretary of War under President Ulysses S. Grant, father of President William Howard Taft

• Alphonso Wilson (1860–1936), African-American activist

• Alphonso Wood (1810–1881), American botanist and theology instructor

Nickname

• Alphonso Cox (1908–1964), American Negro League pitcher

• Alphonso Sharland, member of the pop-rock band The Hoosiers

Fictional characters

• Don Alfonso, in Mozart's opera

• Alphonso, protagonist in , an opera by Franz Schubert

• Alphonso Ali, a minor character in the comic strip Bloom County

• Alfonzo Dominico Jones, a dog in the Australian television series SeaChange

• Al MacKenzie, a Marvel Comics character

• Alfonso "French" Sosa, a main character from The OA, an American television series

See also

• "Alfonso" (song), a 2013 song by Levante

• Alphonsus Liguori (1696–1787), Roman Catholic theologian

• Alphons

• Alphonse