A by-election was held for the New South Wales Legislative Assembly electorate of Patrick's Plains on 4 July 1861 because of the resignation of William Lesley.[1]
| Date | Event | |
|---|---|---|
| 5 June 1861 | William Lesley resigned. | |
| 12 June 1861 | Writ of election issued by the Speaker of the Legislative Assembly.[2] | |
| 4 July 1861 | Nominations | |
| 8 July 1861 | Polling day | |
| 20 July 1861 | Return of writ |