Slocum is a small lunar impact crater in the southeastern part of the Mare Smythii.

It lies near the eastern limb of the Moon, and from the Earth this section of the surface is viewed at a very oblique angle.

In addition, libration of the Moon in its orbit can cause this area to be completely hidden from Earth.

Nearby craters of note include Runge to the west-northwest, Warner to the west-southwest, and Swasey to the south-southeast.

This is a roughly circular, bowl-shaped crater that is surrounded by lunar mare.