The trudeaumanie was the nickname given to the great passion caused by the entry in Canadian policy of Pierre Elliott Trudeau in 1968.

Many young people in Canada at that time were influenced by the Contre-culture Années 1960 and were identified in Trudeau, perceived like young person, energetic and anticonformist. It was indeed easy for the young people of this time to be identified with this man; he had already been a Marxist sympathizer and had militated within the Co-operative the Commonwealth Federation, the social democrat party precursory of the Nouveau Democratic party. The young people were also attracted by its positions on the rights of the person, including the rights of homosexual and the women's rights (as a Minister for Justice under Lester Pearson, it legalized the Homosexualité and liberalized the laws on the Divorce).

Trudeau was admired by its fans for his relaxed style and its relations with famous people. Many young people were impressed by his charm and its appearance, and it attracted itself good number of admirors through all the country. It was often challenged in the street to sign an autograph or to be made take in photograph with one of its partisans.

The trudeaumanie starts to be blown when Pierre Trudeau marries Margaret Sinclair in 1971, but it remains today one of the politicians and the most adulated and admired Canadian Prime Ministers (and also one the most hated of, in particular in the provinces of the Western, at the preserving intellectuals and in certain sections of the Québécois company). In 2004, it was voted the third larger Canadian by the televiewers of CBC, behind the father of the universal health system Tommy Douglas and the militant for cancer Terry Fox.

Today, the trudeaumanie is evoked with nostalgia in central Canada, whereas one remembers it with a quasi-universal dislike in the Canadian West. It was a single phenomenon in Canadian policy which transformed a politician into icon of the popular culture.