Protagoras is a lunar impact crater that is located on the Mare Frigoris on the northern part of the Moon. To the north-northwest is the slightly larger Archytas crater, and to the southeast is the prominent Aristoteles crater.

The rim of Protagoras is circular and rises above the surrounding flat terrain, although the rim dips down along the southwest edge. The interior floor contains a few light markings but no formations of interest. There is an area of rough terrain just to the east of this crater, but the surroundings are otherwise level with only a few small craters in the vicinity.

General characteristics
Latitude	56.0° N
Longitude	7.3° E
Diameter	22 km
Depth	2.1 km
Colongitude	353° at sunrise
Eponym	Protagoras
References	See listing

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Protagoras crater.

Protagoras	Latitude	Longitude	Diameter
B	56.3° N	5.7° E	4 km
E	49.5° N	0.5° E	6 km

"Ancient Greeks on the Moon"