Asa is a given name in several parts of the world. In English, the usual pronunciation is or .
- Asa (אסא): derived from the Hebrew language, as the name appears in the Old Testament to designate the third King of Judah, who reigned for forty years. It became a popular American name because of the influence of the Puritans in the 17th century.
- Asa: a Hebrew name meaning healer and/or physician (Ase).
- Åsa (pronounced "o-sa"): a Swedish name related to one of the most ancient Norse names, referencing Æsir, which means "goddess".
- Asa (pronounced "asha"): a Yoruba language word which means or refers to the 'hawk' bird.
- Asa (pronounced "aa-saa"): an Igbo Nigerian name with the meaning "Beautiful”
- Asa (朝 or あさ): Japanese name meaning "morning".
- Asa: Indonesian for "Hope".
- Asa: Portuguese means "Wing".
- Asa: [Malagasy] (native tongue of Madagascar) means "Work."
- Asha : Nepali means "Hope"
- Asa: Punjabi means “Hope”
- Asa: Filipino means “Hope”.
- Asa Andrew (born 1971), American doctor and radio host
- Asa Baber (1936–2003), American author and Playboy columnist
- Asa Biggs (1811–1878), American politician
- Asa Briggs (1921–2016), British historian
- Asa S. Bushnell (governor) (1834–1904), American politician, 40th Governor of Ohio
- Asa Butterfield (born 1997), British actor
- Asa Earl Carter (1925–1979), American segregationist, Ku Klux Klan leader and Western novelist
- Asa Coon (1993-2007), perpetrator of the 2007 SuccessTech Academy shooting
- Asa Griggs Candler (1851–1929), founder of the Coca-Cola company
- Asa Danforth (1746–1818), early settler in Onondaga County, New York
- Asa Gray (1810–1888), American botanist
- Asa Hall (born 1986), English footballer
- Asa Hartford (born 1950), Scottish football player and coach
- Asa Grant Hilliard III (1933–2007), African-American professor of educational psychology
- Asa Hutchinson (born 1950), American politician and lawyer
- Asa Jackson (born 1989), American football player
- Asa Jennings (1877–1933), American Methodist pastor who evacuated 350,000 Greeks and others from Turkey
- Asa Kasher (born 1940), Israeli philosopher and linguist
- Asa Keisar (born 1973), Israeli Jewish advocate for veganism
- Asa Lanova (1933–2017), Swiss dancer and author
- Asa Lovejoy (1808–1882), American businessman and politician
- Asa Mader (born 1975), American film director, screenwriter and visual artist
- Asa C. Matthews (1833–1908), American lawyer, judge and politician
- Asa Messer (1769–1836), American Baptist clergyman and educator; President of Brown University from 1804 to 1826
- Asa Packer (1805–1879), American businessman and politician
- A. Philip Randolph (1889–1979), African-American leader of the Civil Rights Movement and founder of the first black labor union in the U.S.
- Asa Robinson, rugby league footballer
- Asa Taccone (born 1983), lead singer of indie rock band Electric Guest
- Asa Wentworth Tenney (1833–1897), US federal judge
- Asa Wentworth Jr. (1797-1882), American businessman and politician
- Asa Whitney (1797–1874), American merchant and transcontinental railroad promoter
- Asa Yoelson (1886–1950), birth name of Al Jolson, singer and actor
- Asa of Judah, third king of Judah, son of Abijam, grandson of Rehoboam
- Asa the Black Monk, a character in The Devil and Daniel Webster
- Asa Buchanan, in the American soap opera One Life to Live
- Asa Griffiths, in the novel An American Tragedy by Theodore Dreiser
- Asa Hawks, in the novel Wise Blood by Flannery O'Connor and the film of the same name.
- Asa Heshel, in the novel The Family Moskat.
- Asa "Asey" Mayo, in the mystery novel series by Phoebe Atwood Taylor
- Asa Mitaka, in the Chainsaw Man manga series
- Asa Phelps, in The Simpsons episode "Raging Abe Simpson and His Grumbling Grandson in 'The Curse of the Flying Hellfish'"
- Asa Pike, in the young adult novel series, Charlie Bone
- Asa Shigure, in the Shuffle! media franchise