This is a list of appointments to the New South Wales Legislative Council, caused by the resignation or death of an incumbent member.
A departure creates a casual vacancy which is filled by a candidate of the same affiliation in a joint sitting of the Parliament of New South Wales.
The Constitution of New South Wales states that if the previous sitting Legislative Council member was at the time of his/her election the representative of a particular political party, the nominated candidate for the vacancy must be a member of that same party.
From 1934 until the 1978 electoral reforms, which introduced direct election of members of the Legislative Council, casual vacancies were filled by a vote of a joint sitting, not necessarily with a member of the same party.
From 1978 until the 1991 amendments, casual vacancies were filled by the highest-polling unelected member of the party's ticket from the previous election who nominated for the vacancy, who would then be declared elected by the Governor, with a provision for joint sittings only where no one could be chosen by the former method.