Ludvig Peter Fenger (7 July 1833 – 9 March 1905) was a Danish architect.
He was a proponent of the Historicist style and from 1886 to 1904 he was City Architect in Copenhagen.
Among his works are several churches, the Central Fire Station and Vestre Prison in Copenhagen.
He also directed the renovations of Church of Holmen and Christian IV's Stock Exchange.