The Ottawa Capitals were the competing clubs of the Capital Amateur Athletic Association (CAAA) of Ottawa, Ontario, Canada. The Association competed in ice hockey, lacrosse and other athletics.
Perhaps best known are the early amateur senior men's ice hockey clubs which played from the 1890s until 1920. The club would challenge for the Stanley Cup in 1897, but abandon its challenge after one game, after it lost 15–2. The Capitals would later precipitate the breakup of the Amateur Hockey Association of Canada (AHAC). The nickname 'Capitals' is sometimes applied to the Ottawa Hockey Club (aka HC Generals/Senators), however the two teams were not affiliated.
The Capital Lacrosse Club was also successful, and won the first Minto Cup in 1901.