Hahn is a lunar impact crater that is located near the northeastern limb of the Moon.

It is located less than one crater diameter to the southeast of Berosus, a slightly smaller formation.

A smaller crater lies across the northwest rim, forming a break that reaches the interior floor.

At the midpoint of the interior is an elongated central ridge, with the longer extent oriented north–south.

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