Vendelinus is an ancient lunar impact crater located on the eastern edge of Mare Fecunditatis.

The crater was named after a Flemish astronomer Godefroy Wendelin in 1651 by Giovanni Riccioli.

The smaller Lohse overlaps the rim to the northwest, and at the south end the crater wall is joined to Holden.

It lacks a central peak, but includes multiple impact craters of various dimensions.

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