1 Eastern Victoria Nationals MLC Danny O'Brien resigned on 2 February 2015 to contest the by-election for the lower house seat of Gippsland South. Melina Bath was appointed to replace him on 16 April 2015.
3 Northern Victoria Labor MLC Steve Herbert resigned on 6 April 2017. Mark Gepp was appointed to replace him on 7 June 2017.
4 Northern Metropolitan Greens MLC Greg Barber resigned on 28 September 2017. Samantha Ratnam was appointed to replace him on 19 October 2017.
5 Western Metropolitan DLP MLC Rachel Carling-Jenkins changed party affiliation on 26 June 2017, from the DLP to the Australian Conservatives. On 3 August 2018 she resigned from the Conservatives to sit as an independent.
6 Western Metropolitan Greens MLC Colleen Hartland resigned on 8 February 2018. Huong Truong was appointed to replace her on 21 February 2018.