《啊，加拿大》或《噢！加拿大》（英语：O Canada、法语：Ô Canada）是加拿大国歌。原本是圣施洗者约翰协会（Société Saint-Jean-Baptiste）的爱国音乐，为卡力沙·拉瓦雷（Calixa Lavallée）作曲配最先出现的阿多尔夫·贝西·卢提尔（Adolphe-Basile Routhier）爵士所写的法文歌词。1906年，歌词被翻译为英文。1908年，罗伯特·斯坦利·韦尔重新填写了英文版歌词，新版本不是法文版的直接翻译。罗伯特谱写的英文版曾被修改两次，最后一次修定为1980年，而法文版歌曲从未修改过。《啊，加拿大》从1939起成为事实上的加拿大国歌，但直到1980年才成为法定国歌。

"O Canada" (French:Ô Canada) is the national anthem of Canada. The song was originally commissioned by Lieutenant Governor of Quebec Théodore Robitaille for the 1880 Saint-Jean-Baptiste Day ceremony; Calixa Lavallée composed the music, after which words were written by the poet and judge Sir Adolphe-Basile Routhier. The lyrics were originally in French and an English version was created in 1906. Robert Stanley Weir wrote in 1908 another English version, which is the official and most popular version, one that is not a literal translation of the French. Weir's lyrics have been revised twice, taking their present form in 1980, but the French lyrics remain unaltered. "O Canada" had served as a de facto national anthem since 1939, officially becoming Canada's national anthem in 1980 when the Act of Parliament making it so received Royal Assent and became effective on July 1 as part of that year's Dominion Day celebrations.