Blackadder is a surname. Notable people and fictional characters with this surname include:

• Agnes Forbes Blackadder (1875–1964), Scottish medic
• Charles Blackader (1869–1921), British general in the First World War
• Elizabeth Blackadder (1931–2021), Scottish painter
• John Blackadder (preacher) (ca. 1622–1685) Scottish Presbyterian Covenanter preacher
• John Blackadder (soldier) (1664–1729), Scottish soldier
• Robert Blackadder (d. 1508), medieval Scottish cleric, diplomat and politician
• Todd Blackadder (born 1971), New Zealand rugby player

• Edmund Blackadder, various related characters on Blackadder
• Vivian Blackadder, on JAG

This page lists people with the surname Blackadder.
If an internal link intending to refer to a specific person led you to this page, you may wish to change that link by adding the person's given name(s) to the link.