Hartwig is a lunar impact crater that is located near the western limb of the Moon.

It is attached to the eastern rim of the prominent crater Schlüter, to the northeast of the Montes Cordillera mountain range that surrounds the Mare Orientale.

To the east-northeast of Hartwig is the larger crater Riccioli.

This crater lies within the outer blanket of ejecta that surrounds the Mare Orientale impact basin, and its form has been modified by this material.

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