Ahrens is a German surname which may refer to:
- Persons
- Adolf Ahrens (Bremen) (1879-1957), German captain and politician (DP)
- Adolf Ahrens (Delmenhorst) (born 1898), German politician and mayor of Delmenhorst
- Albert Ahrens (Varel - Palermo) (2.6.1852 - 17.5-1938), German businessman emigrated to Sicily in the 19th century, where he grounded, together with his wife Johanna Benjamin, a furniture factory, a wein factory and a textile enterprise. Albert Ahrens, who was also Honorary Consul of Uruguay, was awarded "Commendatore dell'Ordine della Corona d'Italia" by Vittorio Emanuele III, King of Italy.
- Alfred Ahrens (1899-1959), German regional politician (Schleswig-Holstein) (SPD)
- Angelika Ahrens (born 1972), Austrian journalist and presenter
- Arne Ahrens (born 1975), German film director, scriptwriter and producer
- August Ahrens (1779–1867), entomologist
- Bernhard Ahrens (1905-1978), German regional politician (Schleswig-Holstein) (SPD)
- Brigitte Ahrens (born 1945), German singer
- Chris Ahrens (ice hockey) (born 1952), retired American professional ice hockey defenceman
- Dave Ahrens (born 1958), former American Football linebacker
- Edward H. Ahrens (1919-1942), Navy Cross recipient
- Frank Ahrens (born 1963), German footballer
- Frank Ahrens, Washington Post reporter
- Franz Heinrich Ludolf Ahrens (1809-1881), German philologist
- Franz Ahrens (architect) (1858-1937), German architect
- Georg Ahrens (1896-1974), German politician (Hamburg) (NSDAP)
- Gerd-Axel Ahrens (born 1948), German traffic scientist
- Gerhard Ahrens (born 1932), German footballer
- Gustav Ahrens (1860-1914), German banker
- Hans Georg Ahrens (born 1944), German opera singer (Bass)
- Hans Jürgen Ahrens (born 1941), German manager
- Heinrich Ahrens (1808-1874), German philosopher
- Franz Heinrich Ludolf Ahrens (1809-1881), German philologist
- Heinz Werner Ahrens (born 1941), German administrator at the AOK
- Hermann Ahrens (1902-1975), German politician (GB/BHE)
- Henning Ahrens (born 1964), German writer
- Janette Ahrens (born 1923), American figure skater
- Joseph Ahrens (1904-1997), German composer and organist
- Karl Ahrens (born 1924), German politician (SPD)
- Kurt Ahrens, Jr. (born 1940), former sports car racing and touring car racing driver
- Lynn Ahrens (born 1948), American musical theatre lyricist
- Mariella Ahrens (born 1969), German actress
- Marlene Ahrens (born 1933), Chilean athlete
- Mathias Ahrens (born 1963), German hockey trainer
- Rupert Ahrens (born 1957), German entrepreneur
- Sandra Ahrens (born 1974), German regional politician (Bremen) (CDU)
- Sieglinde Ahrens (born 1936), German organist
- Silvia Poll Ahrens (born 1970), Nicaraguan-born swimmer
- Wilhelm Ahrens (1872-1927), German mathematician and writer
- Wilhelm Ahrens (1912-1998), German soldier
- Others
- USS Ahrens (DE-575), a Buckley class destroyer escort
- Ahrens (manufacturer), former aircraft manufacturer