MacMillan is a bowl-shaped lunar impact crater on the eastern fringes of the Mare Imbrium.

It was named after American mathematician and astronomer William Duncan MacMillan.

[1] It is located just to the southwest of a lone rise, near the southwestern edge of the Montes Archimedes.

This is a cup-shaped depression in the surface with an interior albedo that matches the nearby lunar mare.

It shows some indications of a concentric crater.