Harold Douglas Pratt Jr. (born July 23, 1944 in Charlotte, North Carolina), often credited in the short form H. Douglas Pratt or as Doug Pratt, is an American ornithologist, bio acoustican, wildlife photographer, bird illustrator, and musician. His main research field are the endemic avifaunas of Hawaii and other islands in the Pacific where he was one of the pioneers of the voice recordings of birds. Pratt is a Fellow of the American Ornithologists' Union.