“Sister ship clause”中文就是“姐妹船条款”，是船舶保险（hull policy）中的一个条款，可以理解为，若两艘由同一被保险人拥有的船只相撞，被保险人享有相同的权利，如同两艘船由不同人所有并单独投保。

以International Hull Clauses (01/11/03)（国际船舶保险条款）为例，其中“Sister ship clause”规定如下：

“7 SISTERSHIP

Should the insured vessel come into collision with or receive salvage services from another vessel belonging wholly or in part to the same Owners or under the same management, the Assured shall have the same rights under this insurance as they would have were the other vessel entirely the property of Owners not interested in the insured vessel; but in such cases the liability for the collision or the amount payable for the services rendered shall be referred to a sole arbitrator to be agreed upon between the Underwriters and the Assured.”

（若被保险船舶与完全或部分属于同一所有人或在同一管理下的另一艘船舶相撞，或接受完全或部分属于同一所有人或在同一管理下的另一艘船舶的救助服务，则被保险人应享有在另一艘船舶完全属于与被保险船舶不具有任何利益关系的所有人财产的情况下享有的相同权利；但是，在该等情况下，有关碰撞责任的认定或应付救助服务费用的确定应提交至保险人与被保险人一致同意的独任仲裁员进行仲裁。）