Mark Alfred Dreyfus KC (born 3 October 1956) is an Australian politician and lawyer who has been attorney-general of Australia and cabinet secretary since June 2022, having held both roles previously in 2013 and from 2010 to 2013 respectively.

He ordered the discontinuation of the prosecution of whistleblower Bernard Collaery, and has pledged reform to the Privacy Act in response to several high-profile data breaches that have taken place in Australia.

[4] Before entering parliament, Dreyfus worked as a barrister for twenty years, with an extensive practice in commercial, defamation, constitutional and environmental law.

He appeared before the High Court in the leading implied freedom of political communication cases of Theophanous v Herald & Weekly Times Ltd (1994) and Lange v Australian Broadcasting Corporation (1997).

[6] In March 2006, Dreyfus successfully challenged the sitting Labor member for the Division of Isaacs, Ann Corcoran, for the right to contest the 2007 election.

[8] Following Labor's victory at the 2007 Australian federal election, Dreyfus was appointed the Chair of the House of Representatives Legal and Constitutional Affairs Committee.

[25] Dreyfus served as Labor's Shadow Attorney-General from 2013 to 2022, where he championed the establishment of a Federal Integrity Commission[19] and greater funding for community legal centres.

[27] In his first interview as Attorney-General he said legislating Labor's promised national anti-corruption commission by the end of 2022 was his "paramount priority", calling it a "nation-building" reform.

[30] On 7 July 2022 Dreyfus used his powers as Attorney-General to discontinue the prosecution of lawyer Bernard Collaery, which had been initiated by his predecessor Christian Porter.

[32][33][34] Dreyfus led the establishment of the Royal Commission into the Robodebt Scheme, announcing the Letters Patent on 25 August 2022 alongside Prime Minister Anthony Albanese.

[42] Dreyfus is a keen swimmer, cyclist and runner and is a frequent participant in open water swims and fun runs within his electorate.