This list includes every by-election held in the Australian state of Victoria for the Legislative Council. Prior to the Constitution (Parliamentary Reform) Act 2003 which came into force at the 2006 election, it was necessary for a by-election to be held to fill any vacancy; they have since been filled by an appointment by a joint sitting of the Parliament of Victoria.
258 by-elections were held from 1852 to 2002. 96 were triggered by the death of the incumbent and 110 by their resignation. 44 were held when the incumbent had to seek re-election to serve as a minister; one of which resulted in the incumbent, Henry Miller, being defeated. 2 by-elections were triggered by the original election being declared void and another 2 when the incumbent became inelligable to sit during their term. 17 by-elections resulted in a change of party.
By-elections which resulted in a change in party representation are highlighted as: Gains for the Labor Party and its splinter groups in ; for the Liberal Party and its predecessors in ; for the National Party and its predecessors in and for independents and minor parties in .
List of Legislative Council by-elections