Proportional Representation Society of Australia Inc. (PRSA Inc.) is an electoral reform organisation in Australia. Its membership includes people that have successfully promoted electoral reform.^[1]

The Society regularly reviews and makes submissions on electoral reform within Australia with a focus on multi-member single transferable vote – proportional representation voting systems (PR-STV). It has made submissions to international organizations including the United Nations and the New Zealand Parliament.

Forerunners of the Society began before Australian Federation with Catherine Helen Spence as one of their founding members. See details of the growth and success of quota-preferential proportional representation (PR-STV)in Australia, particularly at the national level.

Catherine Helen Spence's 1861 booklet,^[2] A Plea for Pure Democracy, and her other writings and activism encouraged the 1895 formation of a proportional representation group called the 'Effective Voting League of South Australia'. (Spence was the first female candidate at a public election in the then British Empire when she stood unsuccessfully (under the quite unfair multiple vote^[3]) for election to the 1897 Australasian Federal Convention.)

A statue in Light Square in Adelaide, unveiled on 10 March 1986 by Queen Elizabeth II, commemorates Miss Spence. The PRSA reprinted her 1861 booklet. Her memory is also preserved in her published autobiography and the novels she wrote. In some places even outside Australia, PR-STV (and its single-winner version, instant-runoff voting) was referred to as Hare-Spence in honour of her work.^[4]

She was depicted on the Australian $5 banknote issued for the Centenary of Federation, in 2001.

PRSA Inc's SA members (in the Electoral Reform Society of South Australia) influenced the replacement of the only party-list system used, briefly, for Australian parliamentary elections, introduced by the Dunstan Labor Government in 1973, by direct election using the present quota-preferential form of proportional representation (PR-STV) that the SA Electoral Act 1985 prescribes for elections for SA's Legislative Council. (The SA Constitution Act 1934 requires a referendum before either House can be abolished, but does not specify or entrench the electoral system.)

The Society advocates the use of Hare-Clark proportional voting, a form of the Single Transferable Vote method (PR-STV) currently in use for elections in Tasmania and the Australian Capital Territory.

It publishes a quarterly newsletter entitled Quota Notes.

The Society has also published educational documents and aids such as

• Rules for Counting Single Transferable Votes^[5]
• The Gerrymander Wheel, a simple calculator to demonstrate the perceived futility of drawing geographical boundaries in a single-member electorate system.^[6]

PRSA Inc. also provides services in counting votes or fully conducting elections^[12] for corporate and community organizations in Australia including economical computations of results by email. See its list of clients.

The Society maintains a connection with:

• The Electoral Reform Society
• STV Action UK
• The Center for Voting and Democracy USA
• Fair Vote Canada
• Fair Voting British Columbia