Following is a list of credit unions operating in South Australia (SA), a state in the southern central part of the country. Adelaide, the capital of the state, has a population of over 1.3 million.

Australian Central Credit Union (trading as People's Choice Credit Union) – The largest credit union in South Australia, with over 375,000 members as of March 2021.

Credit Union SA – One of the leading credit unions in South Australia with around 50,000 members. It offers savings and transaction accounts, home loans, personal and car loans, Visa debit and credit cards, home, motor, travel and health insurance, landlord insurance, mobile and online banking, pensions and retirement planning, foreign cash and foreign exchange, money transfers and more.

Fire Service Credit Union – A credit union for Firefighters, by Firefighters. It offers fee free banking products and services. It is one of the several closed bond credit unions left in the country. As of June 30, 2020, FSCU recorded $70 million in total assets and $65 million in deposits.

Police Credit Union, headquartered in Adelaide, is a major sponsor of Crime Stoppers SA. It offers current and savings accounts with highly competitive interest rates, low-cost credit cards with no annual fee, consumer loans, internet banking, and more. It has a customer satisfaction rating of over 90% according to Roy Morgan. Alexander Paul Zimmermann is Chairman and Costa Anastasiou is Chief Executive Officer (CEO) of PCU.

Alliance One Credit Union – Alliance One was acquired by Community CPS Australia Limited (trades as Beyond Bank) in July 2013.

Community CPS Australia Ltd was one of the four largest credit unions in the country. In 2013, Community CPS became a mutual bank called Beyond Bank Australia.

Polish Community Credit Union Limited was established in 1979 and merged with Community CPS Australia Ltd in May 2009.

Powerstate Credit Union Ltd was one of the largest credit unions in South Australia. It merged with Satisfac Direct Credit Union in 2009.

Savings and Loans Credit Union (SA) merged with Australian Central Credit Union in December 2009, to form the second largest credit union in the country.

Satisfac Direct Credit Union Ltd merged with Powerstate Credit Union in August 2009, creating Credit Union SA.