Members of the South Australian House of Assembly, 1918–1921

This is a list of members of the South Australian House of Assembly from 1918 to 1921, as elected at the 1918 state election:


 * Alexandra Liberal MHA Archibald Peake died on 6 April 1920. Liberal candidate Herbert Hudd won the resulting by-election on 12 June.
 * East Torrens MHA John Albert Southwood resigned from the National Party in 1920 and served out his term as an independent Labor member.
 * Murray Liberal MHA Angas Parsons resigned on 5 January 1921. No by-election was held due to the proximity of the 1921 state election.
 * Sturt Liberal MHA Edward Vardon resigned on 15 February 1921 in order to nominate for a casual vacancy in the Australian Senate. No by-election was held due to the proximity of the 1921 state election.