Detlev is a German given name. People with this name include:
Detlev Blanke (born 1941), interlinguistics lecturer at Humboldt University of BerlinDetlev Bronk (1897–1975), President of Johns Hopkins University in Baltimore, MarylandDetlev Buchholz, theoretical physicist at Göttingen UniversityDetlev Buck (born 1962), German film director and actorOtto Detlev Creutzfeldt (born 1927), German physiologist and neurologistDetlev Dammeier (born 1968), German football coach and a former playerWilhelm Heinrich Detlev Körner (1878–1938), illustrator of the American WestDetlev Lauscher (1952–2010), German footballer who played as a strikerDetlev von Liliencron (1844–1909), German lyric poet and novelist from KielDetlev Mehlis (born 1949), Senior Public Prosecutor in the Office of the Attorney General in BerlinDetlev F. Neufert, German author, filmmaker and current president of the German Thai Media AssociationDetlev Peukert (1950–1990), German historianDetlev Ploog (1920–2005), German clinical psychiatrist, primate behavior researcher and anthropologistChristian Detlev Reventlow (1671–1738), Danish diplomat and military leaderDetlev Karsten Rohwedder (1932–1991), German manager and politician (Social Democratic Party)