Barocius is an ancient lunar impact crater that is located in the rugged southern highlands of the Moon.

[1] It lies just to the southeast of the large crater Maurolycus.

To the southwest of Barocius is Clairaut, and to the south-southeast lies Breislak.

The rim of Barocius has been worn and eroded by countless subsequent impacts.

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