Pupin is a tiny lunar impact crater located in the eastern part of the Mare Imbrium.

It was named after Serbian-American physicist Mihajlo Pupin.

[1] It lies to the southeast of the crater Timocharis, and was identified as Timocharis K prior to being renamed by the IAU.

The mare near Pupin is otherwise devoid of significant impact craters, and is nearly featureless except for a faint dusting of ray material.