This is a phase II single-arm, open-label, multicenter study evaluating the efficacy and safety of the combination of induction chemoimmunotherapy with bendamustine and obinutuzumab (BO) followed by consolidation therapy and maintenance therapy with obinutuzumab in subjects who have not received prior cytotoxic chemotherapy for their MCL (i.e., prior single agent rituximab is permitted, prior involved-field radiotherapy is permitted).