This is a list of members of the South Australian House of Assembly from 1918 to 1921, as elected at the 1918 state election:
| Name | Party | Electorate | Term of office |
|---|---|---|---|
| 1902–1912, 1915–1925 | |||
| Liberal | 1912–1921 | ||
| 1908–1921 | |||
| Liberal | 1915–1925 | ||
| 1918–1921 | |||
| National | 1918–1921 | ||
| Labor | 1918–1938 | ||
| Liberal | 1890–1924 | ||
| Labor | 1915–1917, 1918–1933 | ||
| 1918–1924 | |||
| National | 1893–1921, 1924–1930 | ||
| Liberal | 1917–1924, 1924–1930, 1933–1938 | ||
| Labor | 1900–1905, 1906–1933 | ||
| Labor | 1917–1931 | ||
| Labor | 1918–1936 | ||
| Labor | 1915–1917, 1918–1926 | ||
| Liberal | 1912–1924 | ||
| Liberal | 1917–1924, 1925–1930, 1933–1938 | ||
| Labor | 1918–1933 | ||
| Labor | 1915–1917, 1918–1933 | ||
| Liberal | 1912–1915, 1920–1938, 1941–1948 | ||
| Liberal | 1918–1924, 1927–1930, 1933–1956 | ||
| Liberal | 1913–1933 | ||
| Labor | 1918–1950 | ||
| Liberal | 1918–1930 | ||
| Liberal | 1910–1933 | ||
| Liberal | 1915–1956 | ||
| Liberal | 1915–1921 | ||
| Labor | 1918–1921 | ||
| Labor | 1918–1921, 1924–1927, 1938–1960 | ||
| Liberal | 1912–1915, 1918–1921 | ||
| Liberal | 1897–1915, 1915–1920 | ||
| Labor | 1918–1938 | ||
| Liberal | 1918–1924, 1941–1945 | ||
| National | 1905–1921 | ||
| Labor | 1915–1925 | ||
| National | 1915–1932 | ||
| Labor | 1918–1949 | ||
| Liberal | 1902–1922 | ||
| Labor | 1918–1921, 1924–1927 | ||
| Liberal | 1915–1924, 1934–1943 | ||
| National | 1905–1921 | ||
| National/Independent Labor | 1912–1921 | ||
| Liberal | 1915–1930 | ||
| Liberal | 1918–1924 | ||
| Labor | 1918–1924, 1925–1927 | ||
| Liberal | 1912–1927 | ||
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.[1]
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.