The Chatti (also Chatthi or Catti) are an ancient Germanic tribe whose homeland is near the upper Weser.

They settle in central and northern Hesse and southern Lower Saxony, along the upper reaches of the Weser River and in the valleys and mountains of the Eder, Fulda and Weser River regions, a district approximately corresponding to Hesse-Kassel, though probably somewhat more extensive.

According to Tacitus, among them were the Batavians, until an internal quarrel drove them out, to take up new lands at the mouth of the Rhine.