Frank Michler Chapman (June 12, 1864 – November 15, 1945) was a U.S. ornithologist and pioneering writer of field guides.
Chapman was born in West Englewood, New Jersey and attended Englewood Academy. He joined the staff of the American Museum of Natural History in 1888 as assistant to Joel Asaph Allen. In 1901 he was made associate Curator of Mammals and Birds and in 1908 Curator of Birds.
Chapman came up with the original idea for the Christmas Bird Count. He also wrote many ornithological books such as, Bird Life, Birds of Eastern North America, Bird Studies With a Camera, and Life in an Air Castle. For his work, Distribution of Bird-life in Colombia, he was awarded the Daniel Giraud Elliot Medal from the National Academy of Sciences in 1917.