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. There is a slight inward bulge along the northwest wall.
The crater was named by the IAU in 1979 after American astronomer Priscilla F. Bok and Dutch-American astronomer Bart J. Bok.
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.