A by-election was held for the New South Wales Legislative Assembly electorate of Corowa on 9 November 1946 because of the resignation of Christopher Lethbridge (), to contest the federal seat of Riverina at the 1946 election as a Liberal candidate, however he was unsuccessful. Lethbridge then nominated as a candidate to regain the seat.
The by-elections for Albury, Auburn and Ashfield were held on the same day.
<includeonly> The by-election was caused by the resignation of Christopher Lethbridge ().</includeonly>