A by-election was held for the New South Wales Legislative Assembly electorate of Barwon on 16 November 1940 following the resignation of Ben Wade (), to contest the federal seat of Gwydir at the 1940 election, however he was unsuccessful.
|- style="background-color:#E9E9E9" ! colspan="6" style="text-align:left;" |After distribution of preferences
<includeonly> Ben Wade () resigned to unsuccessfully contest the 1940 election for Gwydir. </includeonly>Preferences were not distributed to completion.