Cayley is a small lunar impact crater that is located in a lava-flooded region to the west of Mare Tranquillitatis.

The sloping interior walls are relatively light in hue, having a higher albedo as the surrounding terrain.

However it is not nearly as bright as the slightly larger crater Dionysius to the east-southeast, and lacks a ray system.

The smooth, rolling plains to the east of this crater are called the Cayley Formation.

It is somewhat similar to the lunar maria, but has a slightly higher albedo and is overlapped at the eastern edge by the Mare Tranquillitatis.