Cyril (also Cyrillus or Cyryl) is a masculine given name. It is derived from the Greek name Κύριλλος (Kýrillos), meaning 'lordly, masterful', which in turn derives from Greek κυριος (kýrios) 'lord'. There are various variant forms of the name Cyril such as Cyrill, Cyrille, Ciril, Kirill, Kiryl, Kirillos, Kyrylo, Kiril, Kiro, Kyril, Kyrill and Quirrel.

It may also refer to:

Christian patriarchs or bishops

• Cyril of Jerusalem (c. 313 – 386), theologian and bishop
• Cyril of Alexandria (c. 376 – 444), Patriarch of Alexandria
• Cyril the Philosopher (826–869), co-invented the Slavic alphabet (Glagolitic) and translated the Bible into Old Church Slavonic; namesake of the Cyrillic alphabet
• Pope Cyril II of Alexandria, reigned 1078–1092
• Greek Patriarch Cyril II of Alexandria, reigned in the 12th century
• Cyril of Turaw (1130–1182), Belarusian bishop and orthodox saint
• Pope Cyril III of Alexandria, reigned 1235–1243
• Cyril, Metropolitan of Moscow (died 1572), Metropolitan of Moscow and all Rus' from 1568 to 1572
• Cyril Lucaris (Patriarch Cyril I of Constantinople), reigned for six terms between 1612 and 1638
• Cyril II of Constantinople, patriarch in 1633, 1635–1636, 1638–1639
• Patriarch Cyril III of Constantinople, patriarch in 1652 and 1654
• Cyril IV of Constantinople, patriarch 1711–1713
• Cyril V Zaim, Melkite patriarch of Antioch died 1720
• Cyril VI Tanas, Melkite patriarch of Antioch 1724–1760
• Patriarch Cyril V of Constantinople, patriarch in 1748–1751, 1752–1757
• Cyril VII Siaj, Melkite patriarch of Antioch 1794–1796
• Patriarch Cyril VI of Constantinople, patriarch in 1813–1818
• Cyril, Metropolitan of Belgrade, Metropolitan of Belgrade during 1825–1827
• Patriarch Cyril II of Jerusalem, reigned 1845–1875
• Patriarch Cyril VII of Constantinople, patriarch in 1855–1860
• Pope Cyril IV of Alexandria, reigned 1854–1861
• Pope Cyril V of Alexandria, reigned 1874–1921
• Cyril VIII Jaha, Melkite patriarch of Antioch 1902–1916
• Cyril IX Moghabghab, Melkite patriarch of Antioch 1925–1946
• Patriarch Cyril of Bulgaria, reigned 1953–1971
• Pope Cyril VI of Alexandria, reigned 1959–1971

Other individuals

• Cyrillus, 5th-century Greek jurist
• Cyril Abiteboul (born 1977), French motor racing engineer and manager, formerly the Managing Director of Renault Sport F1 Team
• Cyril Almeida, Pakistani journalist
• Cyril Eugene Attygalle, Sri Lankan Sinhala politician
• Cyril Benson, founder of British company Bensons for Beds
• Cyril Bourlon de Rouvre (born 1945), French businessman and politician
• Sir Cyril Burt (1883–1971), psychologist
• Cyril Connolly (1903–1974), English literary critic and writer
• Cyril Delevanti (1889–1975), British actor
• Cyril Despres (born 1974), French motorcycle rider
• Cyril De Zoysa (1896–1978), Sri Lankan businessman and Buddhist revivalist
• Cyril Dissanayaka, Sri Lankan Sinhala senior police officer
• Cyril Dodd (1844–1913), British politician
• Cyril Domoraud (born 1971), Ivorian football player (senior career 1992–2008) who played for the Côte d'Ivoire national team (1995–2006)
• Cyril Fernando (1895–1974), Sri Lankan Sinhala clinician and researcher
• Cyril Fletcher (1913–2005), English comedian, actor and businessman
• Cyril Gane (born 1990), French mixed martial artist, former interim UFC heavyweight champion
• Cyril Gautier (born 1987), French racing cyclist
• Cyril Goulden (1897–1981), Welsh/Canadian geneticist, statistician, and agronomist
• Cyril Grayson (born 1993), American football player
• Cyril Haran (1931–2014), Gaelic footballer and manager, priest, scholar and schoolteacher
• Cyril Stanley Harrison (1915–1998), English cricketer
• Cyril Leo Heraclius, Prince Toumanoff (born Toumanishvili) (1913–1997), Russian-born historian and genealogist who was a Professor Emeritus at Georgetown University
• Cyril Herath (died 2011), Inspector-General of Sri Lanka Police from 1985 to 1988
• Cyril Jordan (born 1948), American guitarist and founder of the Flamin' Groovies
• Cyril Knowles (1944–1991), English footballer
• C. M. Kornbluth (1923–1958), American science fiction author
• Cyril Lawrence (1920–2020), English footballer
• Cyril Lewis (1909–1999), Welsh footballer
• Sister M. Cyril Mooney (1936–2023), educational innovator in India
• Cyril Nicholas (1898–1961), Sri Lankan Burgher army captain, civil servant, and forester
• Elder Cyril Pavlov (1919–2017), Russian Orthodox Christian monk, mystic and wonder-worker
• Cyril Pearl (1904–1987), Australian journalist
• Cyril Perkins (1911–2013), English cricketer
• Cyril C. Perera (1923–2016), Sri Lankan Sinhala author, translator of world literature into Sinhala
• Cyril E. S. Perera (1892–1968), Sri Lankan Sinhala member of the Ceylon House of Representatives
• Cyril Pinto Jayatilake Seneviratne (1918–1984), Sri Lankan Sinhala military officer and politician
• Cyril Ponnamperuma (1923–1994), Sri Lankan Sinhala scientist in the fields of chemical evolution and the origin of life
• Cyril Ramaphosa (born 1952), South African president, businessman, and trade unionist
• Cyril Ranatunga, Sri Lankan Sinhala army general
• Cyril Richardson (born 1990), American football player
• Cyril Riley, known mononymously as Cyril, an Australian musician, best known for his version of "Stumblin' In"
• Cyril Rioli (born 1989), Australian rules footballer
• Cyril Smith (1928–2010), English Liberal politician
• Cyril Symes (born 1943), Canadian politician
• Cyril Takayama (born 1973), American-Japanese magician
• Cyril Wickramage (born 1932), Sri Lankan Sinhala actor, director, and vocalist

Fictional characters

• Cyril "Blakey" Blake, the bus depot inspector from the 1970s British comedy TV series On the Buses
• Cyril Fielding, character in E. M. Forster's novel A Passage to India
• Cyril Figgis, character in the TV series Archer
• Cyril Gray, character from the film Nanny McPhee and the Big Bang, played by Eros Vlahos
• Cyril Kinnear, the menacing and urbane mastermind from the 1971 British crime film Get Carter
• Cyril Orchard, the murder victim in the 1948 Nero Wolfe mystery And Be a Villain
• Cyril Playfair, the reverend from the 1952 film The Quiet Man
• Cyril Proudbottom, Mr. Toad's horse from the 1949 film The Adventures of Ichabod and Mr. Toad
• Cyril O'Reily, character from television series Oz
• Cyril Sneer, the villain aardvark of the 1980s cartoon series The Raccoons
• Cyril Woodcock, from the film Phantom Thread, played by Lesley Manville
• Cyril the Fogman, a character from the television series Thomas & Friends
• Cyril, a character from Doctor Who
• Cyril, a character from Fire Emblem: Three Houses
• Cyril the Ice Dragon, from The Legend of Spyro
• Cyril the Squirrel, from Maisy
• Cyril, the main character in The Heart's Invisible Furies by John Boyne
• Cyril, a giant squirrel kaiju from Rampage: Total Destruction