Hatshausen is a village in the region of East Frisia, in Lower Saxony, Germany.

The nearby settlements of Ayenwolde, Büschersfehn, and Königshoek are administratively part of the village.

Hatshausen is first mentioned in the Münster parish register of the 15th century as Harstahusum.

He is considered the discoverer of sunspots and wrote a Latin work about them, De macullis in sole observatis, which he had printed in Wittenberg in 1611.

He introduced moor burning and thus buckwheat cultivation to East Frisia.