A by-election was held for the New South Wales Legislative Assembly seat of Riverstone on 22 October 1983.
It was triggered by the resignation of Tony Johnson (Labor).
[1] The Riverstone by-election was held the same day as the by-elections for Kogarah, Maroubra and Marrickville.
All were safe Labor seats and while there was a swing against Labor in each seat (7.2% to 11.8%), all were retained by Labor.
[2]