Linckia guildingi, also called the common comet star, Guilding's sea star or the green Linckia, is a species of sea star reported from the shallow waters of the tropical Pacific Ocean, Indian Ocean, Atlantic Ocean and the Caribbean Sea.

[2][3] Recent studies have indicated that Linckia guildingi may represent several cryptic species.

L. guildingi has a small disc and usually 5 (occasionally 4 or 6) long cylindrical arms.

The upper surface appears smooth but is in fact rough to the touch with low, firm nodules.

Though this starfish is often green, it comes in a range of colours including various shades of brown, blue and dull red.