Ashdown is an English surname. Notable people with the surname include:
Bill Ashdown (1898–1979), English cricketer David Ashdown (1950–2021), Canadian clergyman and politician Doug Ashdown (born 1942), Australian singer-songwriter George Ashdown (1851–1939), Canadian politician Hugh Ashdown (1904–1977), Bishop of Newcastle Isabel Ashdown (born 1970), British author James Henry Ashdown (1844–1924), Canadian merchant Jamie Ashdown (born 1980), English footballer Joe Ashdown (1922–1982), Australian rules footballer John Ashdown-Hill (1949–2018), British historian Paddy Ashdown (1941–2018), British politician Pete Ashdown (born 1967), US businessman and politician Peter Ashdown (born 1934), English racing driver Richard Ashdown (born 1978), English darts master of ceremonies Simon Ashdown, British television writer
See also William Ashdowne (1723–1810), English Unitarian preacher