Nasireddin is a lunar impact crater that lies in the rugged terrain in the southern part of the Moon's near side.

To the east of Nasireddin is the much larger walled plain Stöfler.

There are a few low central peaks near the midpoint of the interior, and a few tiny craterlets to mark the surface.

Nasīr al-Dīn Tūsī was an architect, astronomer, biologist, chemist, mathematician, philosopher, physician, physicist, scientist, theologian, and Marja Taqleed (Islamic scholar).

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