— In this paper, we discuss for the first time the issue of supporting manycasting service over optical burstswitched (OBS) networks. One of the primary challenges in providing manycasting service over OBS networks is to reduce data loss due to burst contentions. We propose two new schemes, static over-provisioning (SOP) and dynamic membership (DM), to alleviate this data loss problem. The proposed schemes take into consideration the specific properties of manycasting, and the schemes may complement existing contention resolution schemes. The effectiveness of the proposed schemes is verified through simulation.