Joseph Steiner, B.A., LL.B., M.Phil., is a partner in the Canadian law firm Osler, Hoskin & Harcourt LLP practicing in the areas of commercial, tax and insolvency litigation.

He has served as President of UJA Federation of Greater Toronto; Chair of UJA Federation's Board of Jewish Education and President of Bialik Hebrew Day School. He currently sits on the Board and Executive Committee of UIA Federations Canada, the Boards of two Toronto Jewish day schools (Bialik Hebrew Day School and the Paul Penna Downtown Jewish Day School),  the Board of Toronto Hebrew Memorial Park and the Budget Committee of the Canadian Council for Israel and Jewish Advocacy (CIJA).

Joseph Steiner served as an Assembly Member on Board Committees from June 2002 through December 2005. Since then, he serves as an Associate-Member of the Board of Governors.