Blackadder is a British television show starring Rowan Atkinson.
Blackadder or Blackader may also refer to:
- Charles Blackader (1869 – 1921), British Army officer
- Blackadder, Scottish Borders, a Scottish village
- Blackadder (clipper), a clipper ship built in 1870
- Blackadder Water, a river in the Scottish Borders
- Clan Blackadder, a Scottish clan
- Blackadder baronets, a Scottish baronetcy
- Blackadder ITC, an OpenType font
- Blackadder (whisky bottler), an independent bottler of Scotch whisky
- Blackadder House, an estate near Allanton, Scotland
- Blackadder (surname), a surname
See also
- Black adder (disambiguation), snakes