Diedrich is both a masculine German given name and a German surname. Notable people with the name include:
Given name Diedrich Bader (born 1966), American actor, voice actor and comedian Diedrich A. Bohlen (1827–1890), German-born American architect Diedrich Diederichsen (born 1957), German writer, music journalist and cultural critic Diedrich Henne (1834–1913), German-born Australian botanist Diedrich Hermann Westermann (1875–1956), German missionary, Africanist and linguist Diedrich Téllez (born 1984), Nicaraguan footballer Diedrich Uhlhorn (1764–1837), German engineer Diedrich Wattenberg (1909–1996), German astronomer Diedrich Willers Jr. (1833–1908), American politician
Surname Friedrich Diedrich (1935–2015), German Roman Catholic theologian John Diedrich (born 1953), Australian actor, director and producer Michael Diedrich (1954–2025), American politician and attorney Szaundra Diedrich (born 1993), German judoka
See also Diedrich Coffee, an American coffee company Diedrick, given name and surname