'''Alsen''' may refer to:
==Places== * Als Island, Denmark; called ''Alsen'' under Prussian/German administration (1864–1920) * Alsen, North Dakota, US * Alsen, South Dakota, US * Alsen, Sweden, a parish and former municipality in Jämtland County, Sweden * Alsen, a hamlet in Catskill, New York, US
==People== *Herbert Alsen (1906–1978), German operatic bass *Elsa Alsen (1880–1975), Prussian-born American operatic soprano
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