The 1933 Bulli state by-election was held on 3 June 1933 to elect the member for Bulli in the New South Wales Legislative Assembly, following the death of MP Andrew Lysaght.
John Sweeney retained the seat for the Jack Lang-led Labor Party despite a negative swing of 17.3% from the 1932 state election. Much of the party's vote went to Albert Willis, who contested the by-election as a "Miners' Candidate" after being expelled from Labor for standing against an endorsed candidate.
Additionally, the Federal Labor Party was expected to contest the by-election after receiving 3.8% of the vote in 1932, but this did not eventuate.