Apollonius is a lunar impact crater located near the eastern limb of the Moon.

It was named after Greek mathematician Apollonius of Perga.

The nearly flat interior floor has a low albedo and has been covered by lava.

It lacks a central peak or notable small craters across the bottom.

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