Jacqueline Ruth Weaver (born 25 May 1947) is an Australian theatre, film and television actress. She is known internationally for her performances in Animal Kingdom (2010) and Silver Linings Playbook (2012), both of which earned her nominations for an Academy Award for Best Supporting Actress.

Weaver emerged in the 1970s as a symbol of the Australian New Wave through her work in Ozploitation films such as Stork (1971), Alvin Purple (1973), and Petersen (1974). Weaver's other films include Picnic at Hanging Rock (1975), Magic in the Moonlight (2014), The Disaster Artist (2017), Bird Box (2018), and Poms (2019).

In 2019-20, Weaver had main roles in Bloom and Perpetual Grace, LTD, and in 2021 she had a recurring role in Season 4 of Yellowstone.

In 2005, she released her autobiography, Much Love, Jac.2022 Winner of TV Week Silver Logie Award for Most Popular Australian Actor or Actress in an International Program in Yellowstone.