The 1994 Glendalough state by-election was a by-election for the seat of Glendalough in the Legislative Assembly of Western Australia held on 19 March 1994. It was triggered by the resignation of Carmen Lawrence (the sitting Labor member and a former premier) on 14 February 1994, in order to contest the House of Representatives at the 1994 Fremantle by-election. The Labor Party retained Glendalough at the by-election, with their candidate, Michelle Roberts, recording 52.7 percent of the two-party-preferred vote.