Kepler is a lunar impact crater that lies between the Oceanus Procellarum to the west and Mare Insularum in the east.

The interior walls of Kepler are slumped and slightly terraced, descending to an uneven floor and a minor central rise.

This was a factor in the choice of the crater's name when Giovanni Riccioli was creating his system of lunar nomenclature, as Kepler used the observations of Tycho Brahe while devising his three laws of planetary motion.

Due to its prominent rays, Kepler is mapped as part of the Copernican System.

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