Marmarabirlik is a Turkish olive-production company. It was established on 28 June 1954 as a Union of Agricultural Sales Cooperative (UASC), cultivating, harvesting and marketing of olives with mutual assistance and cooperation of region’s olive farmers. The founder members of Marmarabirlik were respectively Gemlik, Mudanya and Erdek Olive Agriculture Sales Cooperatives. Later that, Orhangazi, İznik, Edincik, Mürefte, and Marmara Island Olive Agriculture Sales Cooperatives were being involved to the union in various date, today, the working area extended from around İznik Lake to south coast of Marmara Sea then Mürefte, a total of eight members cooperatives that has evolved into a union.