Elections were held in the state of Western Australia on 12 March 1921 to elect all 50 members to the Legislative Assembly. The incumbent government, led by Premier James Mitchell of the Nationalist Party and supported by the Country Party and National Labor Party, won a second term in government against the Labor Party opposition, led by Opposition Leader Philip Collier.

Quick Facts All 50 seats in the Western Australian Legislative Assembly, First party ...

1921 Western Australian state election

← 1917 12 March 1921 1924 →
All 50 seats in the Western Australian Legislative Assembly
First party Second party Third party   Leader Philip Collier Tom Harrison James Mitchell Party Labor Country Nationalist Leader since 16 April 1917 30 July 1919 17 May 1919 Leader's seat Boulder Avon Northam Last election 15 seats 12 seats 16 seats Seats won 17 seats 16 seats 10 seats Seat change 2 4 6 Percentage 36.81% 17.78% 27.73% Swing 11.99 1.28 7.12
Premier before election James Mitchell Nationalist Elected Premier James Mitchell Nationalist

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At this election Edith Cowan became the first woman elected to any Australian parliament.

¹ 164,688 electors were enrolled to vote at the election, but 6 of the 50 seats were uncontested, with 17,740 electors enrolled in those seats. Of these, 3 were held by Labor, 2 by the Country Party and 1 was held by the National Labor Party.

• Members of the Western Australian Legislative Assembly, 1917–1921
• Members of the Western Australian Legislative Assembly, 1921–1924
• First Mitchell Ministry