Matthew John Collins AM KC (born 17 February 1970) is an Australian barrister. He practises predominantly in media law, particularly defamation, as well as constitutional and commercial law. He is best known for having acted in a number of high-profile defamation and free speech cases. In the Queen's Birthday honours list for 2019 he became a member of the Order of Australia (AM) for “significant service to the law, to legal standards, and to education.” He is a former President of the Australian Bar Association.