A by-election was held for the New South Wales Legislative Assembly seat of Bass Hill on 2 August 1986. The by-election was triggered by the resignation of sitting Labor MP Neville Wran.[1] It was won by Liberal candidate Michael Owen.
The Bass Hill by-election was held the same day as the Rockdale by-election.
Neville Wran resigned as Premier of New South Wales after more than 10 years in office. At the time, Wran held the record for the longest uninterrupted stint as NSW Premier. In addition to resigning as Premier, Wran also resigned his seat in the Legislative Assembly, necessitating a by-election to fill the vacancy.