John Bernard "Jack" Mundey AO (17 October 1929 – 10 May 2020) was an Australian communist, union and environmental activist. He came to prominence during the 1970s for leading the New South Wales Builders' Labourers Federation (BLF) in the famous green bans, whereby the BLF led a successful campaign to protect the built and natural environment of Sydney from excessive and inappropriate development. Mundey was the patron of the .