链坑是指天体表面排成一列的多个撞击坑。国际天文联会的行星命名规则将链坑称为「Catena」（复数为 Catenae）。

链坑的形成一般认为是因为一个天体因为受到潮汐力分裂为多个小天体后，仍维持原有的轨道并逐一撞击较大天体，或由火山断裂带形成。最典型的例子就是撞击木星的苏梅克-列维9号彗星。航海家计划在木卫四发现 13 组链坑，木卫三发现 3 组。

月球上的链坑经常是在较大撞击坑旁辐射状分布，这可能是较大撞击坑形成时喷发物撞击月球表面的次级撞击坑或者是火山断裂带上的火山喷发活动造成。

A crater chain is a line of craters along the surface of an astronomical body. The descriptor term for crater chains is catena (plural catenae), as specified by the International Astronomical Union's rules on planetary nomenclature.

Many examples of such chains are thought to have been formed by the impact of a body that was broken up by tidal forces into a string of smaller objects following roughly the same orbit. An example of such a tidally disrupted body that was observed prior to its impact on Jupiter is Comet Shoemaker-Levy 9. During the Voyager observations of the Jupiter system, planetary scientists identified 13 crater chains on Callisto and three on Ganymede (except those formed by secondary craters). Later some of these chains turned out to be secondary or tectonic features, but some other chains were discovered. As for 1996, 8 primary chains on Callisto and 3 on Ganymede were confirmed.