Brenner is an old lunar impact crater that lies in the rugged southeastern part of the Moon's near side.

This ancient formation has been deeply eroded by subsequent impacts, to the point where only the western part still resembles a crater.

That face has the most intact part of the rim, although it has been worn down until it forms a low ridge in the surface.

The southeastern rim is overlain by a relatively old crater designated Brenner A.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Brenner.