This is a list of members of the South Australian House of Assembly from 1956 to 1959, as elected at the 1956 state election:
| Name | Party | Electorate | Term of office |
|---|---|---|---|
| 1956–1968 | |||
| LCL | 1948–1973 | ||
| 1956–1968 | |||
| Labor | 1952–1973 | ||
| LCL | 1946–1959 | ||
| Labor | 1945–1947, 1953–1962 | ||
| LCL | 1956–1977 | ||
| Labor | 1946–1959 | ||
| LCL | 1941–1962 | ||
| Labor | 1953–1979 | ||
| Independent | 1938–1958 | ||
| LCL | 1944–1959 | ||
| LCL | 1956–1960 | ||
| LCL | 1956–1965 | ||
| LCL | 1949–1968 | ||
| LCL | 1956–1957 | ||
| LCL | 1941–1963 | ||
| Labor | 1957–1970 | ||
| Labor | 1950–1970 | ||
| LCL | 1952–1963 | ||
| Labor | 1953–1977 | ||
| LCL | 1956–1962 | ||
| LCL | 1956–1965 | ||
| Labor | 1950–1971 | ||
| Labor | 1956–1970 | ||
| LCL | 1921–1959 | ||
| LCL | 1955–1982 | ||
| Labor | 1918–1921, 1924–1927, 1938–1960 | ||
| LCL | 1930–1938, 1947–1965 | ||
| LCL | 1951–1970 | ||
| LCL | 1933–1968 | ||
| Independent | 1941–1968 | ||
| Labor | 1958–1962 | ||
| Labor | 1933–1970 | ||
| LCL | 1933–1968 | ||
| Labor | 1933–1959 | ||
| Independent | 1933–1970 | ||
| Labor | 1946–1964 | ||
| LCL | 1944–1970 | ||
| Labor | 1941–1968 | ||
| Labor | 1942–1965 | ||
The LCL member for Wallaroo, Leslie Heath, died on 16 July 1957. Labor candidate Lloyd Hughes won the resulting by-election on 3 August 1957.
The Independent member for Mount Gambier, John Fletcher, died on 5 June 1958. Labor candidate Ron Ralston won the resulting by-election on 12 July 1958.
The Labor member for Port Pirie, Charles Davis, died on 27 January 1959. No by-election was held due to the imminent 1959 state election.