Blackadder (disambiguation)
Blackadder is a British television show starring Rowan Atkinson.
Blackadder or Blackader may also refer to:
- 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
- Blackadder Water, a river in Scotland
 - Black adder (disambiguation), snakes