Halliday or Haliday is a surname. Notable people with the surname include:

• Alexander Henry Haliday (1807–1870), Irish entomologist
• Andrew Halliday (journalist) (1830–1877), British journalist and dramatist
• Andrew Halliday (physician) (1782–1839), Scottish physician, reformer, and writer
• Andy Halliday (born 1991), Scottish footballer
• Billy Halliday (1906 – after 1933), Scottish footballer
• Brad Halliday (born 1995), English professional footballer
• Brett Halliday (1904–1977), pen name of American mystery author Davis Dresser
• Bruce Halliday (footballer) (born 1961), English footballer
• Bryant Haliday (1928–1996), American actor
• Charles Haliday (1789–1866), Irish historian and antiquary
• Dave Halliday (1901–1970), Scottish footballer
• David Halliday (physicist) (1916–2010), American physicist and textbook author
• Denis Halliday (born c. 1941), former United Nations Humanitarian Co-ordinator in Iraq
• Ebby Halliday (1911-2015), American realtor
• Edward Halliday (1902–1994), British painter
• Eugene Halliday (1911–1987), artist, philosopher and spiritual teacher
• F. E. Halliday (1903–1982), English academic and author
• Fred Halliday (1946–2010), Middle East scholar
• Fred Halliday (footballer) (1880-1953), English footballer
• Frederick James Halliday (1806–1901), first lieutenant-governor of Bengal
• Harry Halliday (cricketer, born 1920) (1920–1967), English cricketer
• Harry Halliday (cricketer, born 1855) (1855–1922), New Zealand cricketer
• Henry Halliday (1945-2022) Paediatrician and neonatologist
• Jack Halliday (1926–2000), American football player
• James Halliday (Canadian politician) (1845–1921), in the Canadian House of Commons from 1901 to 1904
• James Halliday (weightlifter) (1918–2007), British weightlifter
• James Halliday (wine) (born 1938), Australian wine critic and writer
• Jimmy Halliday (1927–2013), leader of the Scottish National Party (1956–1960)
• John Halliday (actor) (1880–1947), American actor
• John Halliday (ophthalmologist) (1871–1946), Australian doctor
• Jon Halliday (born 1939), Irish historian and co-author of the book Mao: the Unknown Story
• Lin Halliday (1936–2000), American saxophonist
• Matt Halliday (born 1979), New Zealand race car driver
• Mark Halliday (born 1949), American poet
• Martin Halliday (1926–2008), British neurophysiologist
• Michael Halliday (1925–2018), linguist
• Michael Halliday (footballer) (born 1979), footballer from Northern Ireland
• Simon Halliday (Suffolk cricketer) (born 1958), English cricketer
• Simon Halliday (born 1960), English rugby union player and cricketer
• Tommy Halliday (born 1940), Scottish football player
• Toni Halliday (born 1964), English vocalist, lyricist and occasional guitarist of the band Curve
• William Reginald Halliday (1886–1966), historian and archaeologist

• Halladay
• Hallyday
• Andrew Smith Hallidie (1836–1900), promoter of San Francisco's first cable car system and California bridge builder