Dahlen is a Low German surname variation of Dahl originating in medieval Westphalia. Dahlen is also a common Scandinavian surname. The Swedish language spelling replaces the e with é, indicator of an integrated loan word. Dahlen is uncommon as a given name. Notable people with the surname include:

Aida Dahlen (born 1990), Norwegian table tennis player Andreas Dahlén (born 1982), Swedish footballer Armin Dahlen (1919–2013), Austrian actor Ashk Dahlén (born 1972), Persian-born Swedish scholar Barbara K. Charbonneau-Dahlen (1952–2021), Indigenous American activist Beverly Dahlen (born 1934), American poet Bill Dahlen (1870–1950), American baseball player Carl Dahlén (1770–1851), Swedish ballet dancer and choreographer Erland Dahlen (born 1971), Norwegian drummer Geir Dahlen (1960–2024), Norwegian cyclist Gunnar Dahlen (1918–2004), Norwegian footballer Gustaf Dalén (1869–1937), Swedish engineer and inventor Hannah Dahlen, Australian midwife Hermann, Freiherr Dahlen von Orlaburg (1828–1887), Austrian governor of Bosnia and Herzegovina Johanna Elisabeth Dahlén (1757–1845), Danish stage actress Knut Dahlen (1922–1999), Norwegian footballer Jonathan Dahlen (born 1997), Swedish ice hockey player J. P. Dahlén (1881–1938), Swedish politician Micael Dahlén (born 1973), Swedish author Neal Dahlen (1940–2026), American football manager Sverre Dahlen Aspenes (born 1997), Swedish biathlete Ulf Dahlén (born 1967), Swedish ice hockey player Ragna Dahlen (born 1954), Norwegian classical singer

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