The Krumme Lutter is one of the two headstreams of the Lutter in the southern Harz, north of Bad Lauterberg in the district of Göttingen. It rises below 620 m on the Aschentalshalbe and flows towards the south past the former pits Wolkenhügel and Hoher Trost, before it unites with the Grade Lutter in Kupferhütte to become the Lutter.