Reginald Barrett AO (born 1 April 1944) was a Judge (2001–2015), Judge of Appeal (2012–2015) and Acting Judge of Appeal (2016-2020) of the Supreme Court of New South Wales. He had been a corporate and securities lawyer and a partner in Mallesons Stephen Jaques, general counsel for Westpac Banking Corporation and 20 year partner with Allen Allen & Hemsley.