Lutter () is a small river in the Lüneburg Heath, Lower Saxony, Germany, right tributary of the Lachte.
The Lutter has its source near (district of Eschede), southeast of UnterlüÃÂ. It passes Bargfeld (where it is joined by the Schmalwasser), Eldingen, and Luttern (a district of Eldingen). It flows into the river Lachte at , near Lachendorf, east of Celle.