A Bicentennial or Bicentenary is the two-hundredth anniversary of an event, or the celebrations pertaining thereof. It may refer to:
- United States
- United States Bicentennial, the 200th anniversary of the adoption of the Declaration of Independence, celebrated in 1976
- Abraham Lincoln Bicentennial, commemorating the 200th birthday of the United States' 16th president, celebrated in 2009
- War of 1812 Bicentennial
- Latin America
- Argentina Bicentennial, celebrated in 2010
- Bicentennial of Chile, celebrated in 2010
- Celebration of Mexican political anniversaries in 2010
- Uruguay Bicentennial, of the Battle of Las Piedras, celebrated in 2011
- Other
- Australian Bicentenary, celebrated in 1970 on the anniversary of Captain James Cook landing
- Bicentennial of the Encyclopædia Britannica, celebrated in 1968