The Aborigines Progressive Association (APA) was an Aboriginal Australian rights organisation in New South Wales that was founded and run by William Ferguson and Jack Patten from 1937 to 1944, and was then revived from 1963 until around 1970 by Herbert Groves.

The Day of Mourning was a protest held by Aboriginal Australians on 26 January 1938, the 150th anniversary of the arrival of the First Fleet, which marked the beginning of the colonisation of Australia. It was declared to be a protest of 150 years of callous treatment and purposefully coincided with Australia Day celebrations. Day of Mourning protests have been held on Australia Day ever since 1938, though protests sharing its aims on this day are more commonly held under the names Invasion Day or Survival Day.