The Legislative Council was made an elective body in 1856 and by-elections occurred there as well.
Due to the fluid nature of party allegiances during this time no attempt has been made to show them in this list.
Vacancies occurred for the following reasons: * Incumbents sat for Quebec City which was a three-member seat until 1860 when it was split into Centre, East and West districts.
As a result, the by-elections were held for the new single-member seats ** Members of the Brown-Dorion Ministry of August 2–4, 1858 The Legislative Council became an elective body in 1856.
In 1857 Legislative Councillors appointed to office were now required to seek re-election at Ministerial by-elections.