Justin Pierre James Trudeau, MP (born December 25, 1971) is a Canadian politician. He has represented the Montreal electoral division of Papineau in the Canadian House of Commons since 2008 as a member of the Liberal Party and currently serves as the party's critic for youth, post-secondary education, and amateur sport.

Trudeau is the eldest son of the late former Canadian prime minister Pierre Trudeau and Margaret Sinclair Trudeau Kemper. His maternal grandfather, James Sinclair, was also a federal cabinet minister.

Trudeau was born on December 25, 1971, in Ottawa, Ontario. He was only the second child in Canadian history to be born when one of his parents was prime minister; the first was John A. Macdonald's youngest daughter Margaret Mary Macdonald, and Trudeau's younger brothers Alexandre (Sacha) (born December 25, 1973) and Michel (1975–98) were the third and fourth, respectively. Pierre and Margaret Trudeau separated in 1977, when Justin was six years old, and Pierre retired as prime minister in 1984. Of his mother and father's marriage, Trudeau said in 2009, "They loved each other incredibly, passionately, completely. But there was 30 years between them and my mom never was an equal partner in what encompassed my father's life, his duty, his country."