Macrobius is a prominent lunar impact crater located to the northwest of the Mare Crisium.

[2] It lies on the southeast edge of the Lacus Bonitatis, a small lunar mare.

The outer wall of Macrobius has a multiply terraced inner surface, with some slumping along the top of the rim.

The small satellite crater Macrobius C lies across the western rim, but the wall is otherwise relatively free of significant wear.

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