| Country: | New South Wales |
| Type: | parliamentary |
| Ongoing: | no |
| Election Date: | 7 March 1931 |
| Vote Type: | Popular |
| Image1: | Eddie Ward 1941 (cropped).jpg |
| Candidate1: | Eddie Ward |
| Party1: | Australian Labor Party |
| Popular Vote1: | 19,975 |
| Percentage1: | 54.1% |
| Swing1: | 14.3pp |
| Candidate2: | Lionel Courtenay |
| Party2: | Nationalist Party (Australia) |
| Popular Vote2: | 16,333 |
| Percentage2: | 44.2% |
| Swing2: | 12.6pp |
| MP | |
| Before Election: | John West |
| Before Party: | Australian Labor Party |
| After Election: | Eddie Ward |
| After Party: | Australian Labor Party |
| Election Name: | 1931 East Sydney by-election |
| 1Data2: | 44.3% |
| 2Blank: | TPP swing |
| 2Data1: | 14.3pp |
| 2Data2: | 14.3pp |
| 1Data1: | 55.7% |
| 1Blank: | TPP |
A by-election was held for the Australian House of Representatives seat of East Sydney on 7 March 1931. This was triggered by the death of Labor MP John West.
The by-election was won by Labor candidate Eddie Ward, who was associated with New South Wales Premier Jack Lang's wing of the party.
This was the last by-election contested by the Nationalist Party as it would be replaced by the United Australia Party later that year.
Businessman and Sydney alderman Lionel Courtenay won Nationalist preselection for the by-election in February 1931, defeating fourteen other candidates including barrister Norman Cowper, former MLA's James Morrish and Thomas Morrow, former Australian cricket captain Monty Noble, and aviator Keith Smith.[1]