The 1968 Millicent state by-election was a by-election held on 22 June 1968 for the South Australian House of Assembly seat of Millicent.
The by-election was triggered by the Court of Disputed Returns calling a new election. Labor had won the seat by a single vote at the 1968 election. Labor retained the seat with an increased margin. Turnout increased at the by-election.[1]