Newcomb is a lunar impact crater that is located in the rugged Montes Taurus mountain range, to the east of the Mare Serenitatis.

It lies to the northeast of the prominent crater Römer, and north-northwest of Macrobius.

This crater has a sharp-edged and somewhat irregular rim that appears polygonal more than circular.

The south-southwestern part of the rim is overlaid by the smaller crater Newcomb A.

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