Hahausen is a village and a former municipality in the district of Goslar in Lower Saxony, Germany.

Since 1 November 2021, it is part of the town Langelsheim, of which it is an Ortschaft.

[2] It is situated northwest of the Harz mountains, between Seesen and Lutter am Barenberge.

It was part of the former Samtgemeinde ("collective municipality") Lutter am Barenberge.

This Goslar district location article is a stub.