Surname
- Albert Dietrich (1829–1908), German composer and conductor
- Albert Gottfried Dietrich (1795–1856), German botanist
- Amalie Dietrich (1821–1891), German naturalist and museum collector
- Brandon Dietrich (born 1978), Canadian professional ice hockey player
- Craig Von Dietrich (born 1988), American historian
- Fritz Dietrich (Nazi) (1898-1948), German SS officer
- Fritz Dietrich (1905-1945), German musicologist and composer
- Hermann R. Dietrich (1879–1954), German politician
- John H. Dietrich (1878-1957), Unitarian humanist minister
- Marlene Dietrich (1901–1992), German and American actress, singer and entertainer
- Philippe-Frédéric de Dietrich (fr) (1748-1793), French scientist and politician
- Sepp Dietrich (1892–1966), German Waffen-SS general
- William E. Dietrich, American geomorphologist
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