Paul Georg Egmont Duncker (6 May 1870, Hamburg – 28 July 1953, Ahrensburg) was a German ichthyologist.
Following graduation he lived and worked in Karlsruhe, Plymouth, Naples, Cold Spring Harbour (Long Island N.Y.), and Würzburg.
From 1901 he worked as a curator for a year at the Selangor State Museum in Kuala Lumpur, afterwards returning to Europe, where he spent another year in Naples.
[1] In 1939 he became an honorary member of the American Society of Ichthyologists and Herpetologists.
[2] In 1904 he described the Harlequin rasbora, Trigonostigma heteromorpha, a fish species that inhabits the forest streams of Southeast Asia.