防鲨网是一种工具，也是网的一种。用于海域中防止鲨鱼入侵。防鲨网广泛用于各种海场（如在半月湾中就有使用），可用于防止大型、危险性鱼类的攻击。

A shark net is a submerged net placed around beaches to reduce shark attacks on swimmers.

Shark nets do not offer complete protection but work on the principle of "fewer sharks, fewer attacks". They reduce occurrence via shark mortality. Reducing the local shark populations is believed to reduce the chance of an attack. The large mesh size of the nets is designed specifically to capture sharks and prevent their escape until eventually, they drown. Due to boating activity, the nets also float 4 metres or more below the surface and do not connect with the shoreline (excluding Hong Kong's shark barrier nets) thus allowing sharks the opportunity to swim over and around nets. Shark nets can cost up to 1.4 million dollars.