State elections were held in South Australia on 10 February 1912. All 40 seats in the South Australian House of Assembly were up for election. The incumbent United Labor Party government led by Premier of South Australia John Verran was defeated by the opposition Liberal Union led by Leader of the Opposition Archibald Peake. Each of the 13 districts elected multiple members, with voters casting multiple votes.

1912 South Australian state election

← 1910 10 February 1912 (1912-02-10) 1915 →
All 40 seats in the South Australian House of Assembly 21 seats were needed for a majority
First party Second party   Leader Archibald Peake John Verran Party Liberal Union Labor Leader since 5 June 1909 5 June 1909 Leader's seat Victoria and Albert Wallaroo Last election 20 seats 22 seats Seats won 24 seats 16 seats Seat change 4 6 Percentage 51.41% 46.77% Swing 1.83 2.32
Premier before election John Verran Labor Elected Premier Archibald Peake Liberal Union