The 2011–12 Ryobi One-Day Cup was the 42nd season of official List A domestic cricket in Australia.

The season's format reverted to the 50-overs a side format, with Cricket Australia acknowledging the ICC's commitment to 50-over cricket and the 2015 ICC World Cup most likely be staged as a 50-over tournament.

[1] Unlike previous seasons, the competition was not a "complete double round robin", and each state played eight preliminary matches instead of ten.

[2] The final's result was a tie, but the Redbacks had gained a "bonus point" in the round robin series that put them ahead of the Tasmanian Tigers.

[2] The win was South Australia's first One-day domestic title in 25 years.