Rydberg is a lunar impact crater that is located on the far side of the Moon, just past the southwest limb.

This is a little-eroded crater formation with a relatively sharp edge.

The inner walls do not have much terracing, although slumped piles of talus lie along the base.

At the midpoint of the interior is a central ridge, with a low spur that runs halfway toward the southern inner wall.

This feature was named after the Swedish physicist Johannes Rydberg.