The Chattuarii, also spelled Attoarii, were a Germanic tribe of the Franks. They lived originally north of the Rhine in the area of the modern border between Germany and the Netherlands, but then moved southwards in the 4th century, as a Frankish tribe living on both sides of the Rhine. There is no consensus on any connection between the Chattuarii and either the similar-sounding Chatti or, less likely, the Chasuarii, who both lived in a similar region of Germany, and are also mentioned in Roman era texts.