Dieterich () is both a surname and a masculine German given name, a variant of Dietrich, itself the High German form of Theodoric. Notable people with the name include:
Surname: Albrecht Dieterich (1866–1908), German classical philologist and religious scholar Chris Dieterich (born 1958), American football player Heinz Dieterich (born 1943), German sociologist Helwig Dieterich (1601–1655), German physician Johann Christian Dieterich (1722–1800), German publisher Neil Dieterich (born 1943), American lawyer and politician William H. Dieterich (1876–1940), American politician from Illinois William H. Dieterich (judge) (1897–1964), American lawyer and judge from Wisconsin
Given name: Dieterich Buxtehude, (1637/39–1707), German-Danish organist and composer Dieterich Spahn, German-born American artist
See also Dieterich, Illinois, village in Effingham County, Illinois, United States Dietrich Dittrich