Hassan Husseini was a politician and political activist in Ontario, Canada. He was a prominent member of the Communist Party of Canada - Ontario, and led the party in the 1999 provincial election. He left the CPC in 2003.

Originally from Lebanon, Husseini moved to Canada at a young age. He received a Bachelor of Arts degree in History and Political Science from the University of Ottawa in the early 1990s, and became an organizer for the Communist Party in the same period. He was also active in the student, anti-racism, peace and labour movements. Husseini was vice-president and organizer for the Ottawa-Carleton Canadian Union of Public Employees Local 4600 District Council, and coordinated Ottawa's annual Walk for Peace, the Environment and Social Justice.

In November 1998, Husseini was selected as Ontario party leader and international affairs spokesperson at the CPC's 21st Convention. He attracted controversy by defending the FARC rebels of Colombia in a 1998 interview.