Hanna or Hannah is an Irish and Scottish surname, ultimately of Irish origin from O'Hannaidh, or descendants of the lowland Clan Hannay.

Hanna (ܚܲܢܵܐ) is also an Assyrian surname, a shortened form of Yohannan, the Aramaic equivalent for John.

Notable people with the surnames include:

Hanna

• Arthur Dion Hanna (1928–2021), Governor-General of the Bahamas
• Billy Hanna (c. 1929–1975), Northern Irish loyalist and Ulster Volunteer Force leader
• Charles Hanna (1889–1942), American politician
• Ciara Hanna (born 1991), American actress and model
• David Blyth Hanna (1858–1938), Canadian railway executive
• Delphine Hanna (1854–1941), American physical education professor
• Edward A. Hanna (1922-2009), American politician
• Edward Joseph Hanna (1860–1944), American bishop
• Gabbie Hanna (born 1991), American Internet personality
• Gertrud Hanna (1876–1944), German activist and politician
• Gila Hanna (born 1934), Canadian mathematics educator and philosopher of mathematics
• Jack Hanna (born 1947), American animal expert
• James Hanna (died 1787), British maritime fur trader
• James Hanna (born 1989) American football player
• James Hanna (1816-1872), American judge
• Jenn Hanna (born 1980), Canadian curler
• Jim Hanna (c. 1947–1974), Northern Irish loyalist and Ulster Volunteer Force leader
• John Hanna (Indiana politician) (1827–1882), United States Representative from Indiana
• John A. Hanna (1762–1805), United States Representative from Pennsylvania
• John G. Hanna (1889–1948), American sailboat designer
• Kate Hanna (born 1996), Australian field hockey player
• Kathleen Hanna (born 1968), American musician, activist and writer
• Lucy Hanna, American photographer
• Marjorie Hanna, Canadian ballplayer, All-American Girls Professional Baseball League
• Mark Hanna (1837–1904), American industrialist and US Senator
• Mark Hanna (screenwriter) (1917–2003), American screenwriter and actor
• Ray Hanna (1928–2005), New Zealand-born RAF officer, later a civilian pilot and 'warbird' collector
• Richard L. Hanna (1951-2020), United States Representative from New York
• Roland Hanna (1932–2002), American jazz pianist
• Stanley S. Hanna (1920–2012), American physicist
• Stephen Hanna, New York City Ballet principal dancer
• Vincent Hanna (1939–1997), Northern Irish television journalist
• William Hanna (1910–2001), American animator and co-founder of Hanna-Barbera

Hannah

• Alan Hannah (born 1971), Scottish curler and coach.
• Barry Hannah (1942–2010), American author
• Bob Hannah (baseball), American college baseball coach

• Brook Hannah (1874–1961), Australian rules footballer and missionary
• Daryl Hannah (born 1960), American actress
• David Hannah (born 1973), Scottish (association) football player
• Dorita Hannah, New Zealand architect
• Jack Hannah (1913–1994), American director of animated shorts
• John Hannah (actor) (born 1962), Scottish actor
• John Hannah (American football) (born 1951), American former left guard for the New England Patriots
• John Hannah (VC) (1921–1947), Scottish recipient of the Victoria Cross
• John A. Hannah (1902–1991), president of Michigan State University
• John D. Hannah, American author and professor
• John P. Hannah (born 1962), senior aide on national security to Dick Cheney

Hannahs

• Dusty Hannahs (born 1993), American basketball player in the Israeli Basketball Premier League