Bầu cử lãnh đạo Đảng tự do của Canada năm 2003

The Liberal Party of Canada held a leadership election on November 14, 2003, electing former finance minister Paul Martin as the party's new leader, replacing outgoing leader (and prime minister) Jean Chrétien.

Stakes for the race were high as the winner would go on to become prime minister, in addition to leading a party that was high in the polls without a significant challenger.

Paul Martin spent the entire race as the front runner, as his supporters had secured a lock on the party executives of the federal and most provincial sections of the party. Because of Martin's apparent strength, several prominent candidates, such as Allan Rock, and Brian Tobin, did not go beyond the formative stages.

Martin's only serious challengers were John Manley, who withdrew before delegate selection began, and Sheila Copps. Martin easily captured the leadership with 93.8% of the delegates.

The party would be beset by significant infighting afterwards, as he and his supporters moved to remove Chrétien supporters from cabinet and even from Parliament. Martin's initial tactics to secure the leadership were generally seen, in retrospect, as weakening his eventual tenure as prime minister.