1905 Western Australian state election

← 1904 27 October – 13 November 1905 1908 →
All 50 seats in the Western Australian Legislative Assembly
First party Second party   Leader Hector Rason William Johnson Party Ministerialist Labour Leader since 28 September 1904 4 October 1905 Leader's seat Guildford Kalgoorlie (lost seat) Last election 18 seats 22 seats Seats won 33 seats 14 seats Seat change 15 8 Percentage 53.84 35.07% Swing 17.15 7.50
Premier before election Hector Rason Ministerialist Elected Premier Hector Rason Ministerialist

Elections were held in the Australian state of Western Australia in late 1905 to elect 50 members to the state's Legislative Assembly. The main polling day was 27 October, although four remote electorates (Dundas, Gascoyne, Kimberley, and Pilbara) went to the polls on 13 November.

Hector Rason, the sitting premier and a member of the Ministerialist faction, had taken office on 25 August 1905 at the head of a minority government, following the fall of the previous minority government led by Henry Daglish of the Labour Party. Daglish resigned as party leader on 27 September, and was replaced by William Johnson on 4 October. At the election, Rason and the Ministerialists recorded a landslide victory, with their gain of 15 seats allowing them to form a comfortable majority government. Eight Labour members lost their seats, including their leader Johnson, who was defeated in Kalgoorlie by Norbert Keenan.

• Members of the Western Australian Legislative Assembly, 1904–1905
• Members of the Western Australian Legislative Assembly, 1905–1908

¹ The total number of enrolled voters was 121,722, of whom 19,720 were registered in 11 uncontested seats. Eight of the uncontested seats were won by Ministerialists and three by Labour.