The 4th Parliament of Lower Canada was in session from January 9, 1805, to April 27, 1808. Elections to the Legislative Assembly in Lower Canada had been held in July 1804. All sessions were held at Quebec City.
- died in October 1805; John Blackwood was elected in a by-election held in December 1805.
- died in March 1807; Ezekiel Hart was elected in a by-election held in April 1807.
- expelled in February 1808 because he was a Jew.