Cognomen Langan (兰根 
, Langan 
, 朗根 ) , across the world, is quite a common last name. The family name Langan is habitual in Ireland, where it is quite a common surname, the United Kingdom, where it is quite a rare surname, and Australia. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Ireland. Much less frequently, Langan is the forename as well as the last name.
| john langan i husband of Catherine Gallagher, IE (b. 1831) |
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owen francis langan American athlete (1884-1963), US (b. 1884) |
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| hugh p. langan politician (b. 1849) |
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| james langan (1857-1941), US (b. 1857) |
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| john langan ii (1860-1930) husband of Catharine Devaney, US (b. 1860) |
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glenn langan American stage and film actor, US (b. 1917) |
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| louise langan American suffragist and civic leader, US (b. 1870) |
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| arthur chester langan (b. 1871) |
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james patrick langan ii American chemist, US (b. 1931) |
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| john tracey langan (b. 1873) |
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| james patrick langan i (1889-1975) husband of Katherine Mary Norton, US (b. 1889) |
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| tom langan American television producer and writer, US (b. 1901) |
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christopher langan American horse rancher and author who scored high on IQ tests, US (b. 1952) |
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dave langan Ireland international footballer, IE (b. 1957) |
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| joseph n. langan American politician, US (b. 1912) |
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