The AACTA International Award for Best Supporting Actress is an accolade given by the Australian Academy of Cinema and Television Arts (AACTA), a non-profit organisation whose aim is to "identify, award, promote, and celebrate Australia's greatest achievements in film and television".

[2] The winners and nominees are determined by the international chapter of the Academy, which comprises eighty members of Australian film-makers and executives.

[3] It was first handed out by the Academy in 2013 (for films released in 2012) as a discretionary prize, with Jacki Weaver being the first recipient.

The actress in bold and in dark blue background have received a special award; those in bold and in yellow background have won a regular competitive award.

When sorted chronologically, the table always lists the winning actress first, and then the other nominees.