Alday is a surname. The Basque noble family Alday, whose coat of arms is shown at right, originated in Getxo.

Notable people with the surname include: Gene Alday (1957–2016), American Republican politician from Mississippi James Alday (1516–1576?), English navigator, explorer and privateer John Alday (fl. 1570), English translator of semi-philosophical and classical works Luis Trujillo Alday (born 1993), Mexican professional footballer Manuel Alday Marticorena (1917–1976), Spanish footballer who played for Real Madrid Paul Alday (–1835), French violinist and composer resident in Ireland Ricardo Alday Castillo (born 1979), Mexican civil engineer David Alday Alvarez (born 1991), Mexican Photographer

See also Allday (disambiguation)