Casey is a common variation of the Irish Gaelic Cathasaigh/Cathaiseach, meaning "vigilant" or "watchful".^[1] At least six different septs used this name, primarily in the counties of Cork and Dublin.

People with the surname Casey include:

• Adam Casey (disambiguation)
• Al Casey (disambiguation)
• Albert Vincent Casey (1920–2004), United States Postmaster General
• Ann Casey (1938–2021), American professional wrestler
• Anne Casey, New Zealand–trained nurse based in England, developer of Casey's model of nursing
• Bernie Casey (1939–2017), American football player and actor
• Bill Casey (disambiguation)
• Bob Casey (disambiguation)
• Cathal Casey (born 1967), Irish hurler
• Conor Casey (born 1981), American soccer player
• Cortney Casey (born 1987), American mixed martial artist
• Dan Casey (footballer) (born 1997), Irish association footballer
• Dan Casey (baseball) (1862–1943), American baseball player attributed to the poem "Casey at the Bat"
• Daniel Casey (born 1972), English actor
• Daniel Casey (screenwriter) (born 1981), screenwriter
• Dick Casey (c. 1881–1919), Australian rules footballer
• Don Casey, American basketball coach
• Doug Casey (born 1946), American speculator and writer
• Dwane Casey (born 1957), former head coach of the NBA's Detroit Pistons
• Eamonn Casey (1927–2017), Roman Catholic Bishop Emeritus of Galway and Kilmacduagh, Ireland
• Ed Casey (1933–2006), leader of the Australian Labor Party in Queensland
• Eddie Casey (1894–1966), American football player and coach
• Eduardo Casey (1847–1906), Argentine founder of Venado Tuerto
• Edward Pearce Casey (1864–1940), American architect
• E. Owens Blackburne (1848–1894), pen name of Irish writer and novelist Elizabeth Casey
• Eoghan Casey, digital forensics professional
• Francis Dominic Casey (1890–1917), Irish flying ace of the Royal Naval Air Service
• Frank Casey, American Negro league pitcher
• George Casey (disambiguation)
• Gerard Casey (philosopher) (born 1951), professor emeritus at University College Dublin
• Gerard Casey (artist), Irish artist
• Gerard Casey (Irish republican) (died 1989), a member of the Provisional Irish Republican Army
• Hannah Casey (born 1988), Irish rugby union player
• Harry Wayne Casey (born 1951), American musician
• Hugh Casey (disambiguation)
• Jacqueline Casey (1927–1992) American graphic designer
• James Casey (disambiguation)
• Jim Casey (footballer) (born 1957), Scottish footballer
• Joe Casey, American comic book writer
• John Casey (disambiguation)
• Jon Casey (born 1962), American ice hockey player
• Joseph E. Casey (1898–1980), United States Representative from Massachusetts
• Kage Casey (born 2003), American football player
• Karan Casey (born 1969), Irish folk singer
• Karen Casey (born 1947), Canadian politician
• Kathleen L. Casey (born 1966), commissioner of the U.S. Securities and Exchange Commission
• Ken Casey (born 1969), bass guitarist and frontman of the Boston punk rock band Dropkick Murphys
• Kenneth Casey (1899–1965), American composer and child actor
• Kenneth J. Casey (died 2020), California real estate investor
• Kenneth L. Casey (born 1935), neurologist
• Kevin Casey (disambiguation)
• Len Casey (born 1953), English rugby league footballer
• Louise Casey, Baroness Casey of Blackstock (born 1965), British government official
• Luis Morgan Casey, American/Bolivian Roman Catholic bishop
• Lyman R. Casey (1837–1914), United States Senator from North Dakota
• Maie Casey, Baroness Casey (1892–1983), Australian pioneer aviator, poet, librettist, biographer, memoirist and artist
• Marty Casey (born 1973), American rock musician
• Martyn P. Casey (born 1960), Australian rock bass guitarist
• Maurice Casey (1942–2014) British scholar of the New Testament and early Christianity
• Michael Casey (disambiguation)
• Mickey Casey (1905–1968), American baseball player
• Mike Casey (labor leader) (born 1958)
• Natalie Casey, English actress
• Oliver Casey (born 2000), English footballer
• Owen Casey (born 1969), Irish tennis player
• Paddy Casey, Irish singer-songwriter
• Pat Casey (baseball) (born 1959), American baseball coach
• Pat Casey (politician) (born 1961/2), Irish politician
• Patricia Casey, Professor of Psychiatry at University College Dublin
• Patrick Casey (disambiguation)
• Paul Casey (born 1977), English golfer
• Peter Casey (disambiguation)
• Ray Casey (1900–1986), American tennis player and coach
• Raymond Casey (geologist) (1917–2016), British geologist
• Richard Casey (disambiguation)
• Robert Casey (disambiguation)
• Ron Casey (disambiguation)
• Samuel Casey (disambiguation)
• Sean Casey (disambiguation)
• Shaun Casey, American model
• Silas Casey (1807–1882), United States Army officer during the American Civil War
• Solanus Casey (1870–1957), Capuchin priest
• Sophie Casey (born 1991), Australian rules footballer
• Steve Casey (1909–1987), Irish wrestler
• Thomas Casey (disambiguation)
• Tom Casey (Australian politician) (1921–2003)
• Tom Casey (Canadian football) (1924–2002), player for the Winnipeg Blue Bombers
• Tom Casey (diplomat), American diplomat
• Tommy Casey (baseball) (fl. 1887), American baseball pitcher
• Tommy Casey (1930–2009), Northern Irish footballer
• Willet Casey (1762–1848), Canadian farmer and political figure
• William Casey (disambiguation)
• Willie Casey (born 1981), Irish professional boxer
• Willie Casey (Gaelic footballer) (1932–2016), Irish Gaelic footballer
• Zadok Casey (1796–1862), American politician

• the protagonist of Ben Casey, a medical drama television series
• Buster "Rant" Casey, in the 2007 Chuck Palahniuk novel Rant
• Jared Casey, on the soap opera Passions
• John Casey (Chuck), in the television series Chuck
• Kevin Casey (Scrubs), on the medical comedy Scrubs played by Michael J. Fox
• Kevin Casey, a 2007 character from the Australian television soap opera Neighbours
• Michael "Iceman" Casey, in the Wing Commander franchise
• Michael Casey (Sons of Anarchy), fictional character
• Sean Casey, in the 1997 film Night Falls on Manhattan
• Shane Casey, in the television series CSI: NY
• Detective Casey, a character in the Mickey Mouse universe

• Casey (given name)
• O'Casey, a surname
• alternative spelling: Cayce (disambiguation)