Saint John Harbour (French: Saint-Jean-Havre) is a provincial electoral district for the Legislative Assembly of New Brunswick, Canada.

It was represented from its creation for the 1995 election until October 13, 2005 by Elizabeth Weir, the leader of the New Democratic Party of New Brunswick from 1988 to September 25, 2005.

Liberal Ed Doherty had then taken the spot by winning a by-election on November 14, 2005 and was re-elected in the 2006 general election.

The by-election was held on November 14, 2005 and was from the outset thought to be a close race between Lord's Progressive Conservatives and the Liberals with Weir's New Democrats unlikely to be able to compete without her personal popularity, particularly against the large organizations the other parties were likely to bring into the riding from around the province.

Bernard Lord placed his reputation on the line, according to pundits, due to his choice of a high-profile candidate and his announcing over $50 million in spending over the course of the four-week campaign.