Ann Olivarius (born 19 February 1955) is an American-British lawyer who specializes in cases of civil litigation, sexual harassment, and sexual discrimination.
She is the Chair of the Executive Committee at the international law firm McAllister Olivarius, which she established in 1996, and the founder and chair of the non-profit research centre the Rhodes Project.
She is also a well-known campaigner against non-consensual pornography ("revenge pornography").