The South Australian Constitution Act of 1934 sets out the principles and rules and procedures for the government of the State of South Australia.
It provides for certain sections to be altered by the process of a Bill proposing a change passing all readings, approval by a majority of members in both houses of parliament prior to being assented to by the governor. This act also specifies those sections of the SA Constitution that must not only pass a majority vote in both houses but must then be put to the people of SA at a referendum.
The 1934 Constitution Act repealed a number of older acts, including The Constitution Act (No. 2 of 1855) and several Constitution Amendment Acts. The 1855 act established the parliament of the Province of South Australia.