Bok is a lunar impact crater that is located on the far side of the Moon.

To the southeast is the crater Sniadecki; to the north is McKellar, and further to the west is De Vries.

The rim of Bok is well-defined and is not significantly eroded.

The inner walls slope gently down to the nearly level interior floor, which has a central peak near the midpoint.

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