Frederick Nutter Chasen (1896 – 13 February 1942) was an English zoologist. Chasen was born in Norfolk, England. He was apprenticed to Frank Leney of the Norwich Museum in 1912, joining the Museum as a full-time employee in 1919. Between these dates Chasen fought in the First World War (1914 - 1918) with the Norfolk Yeomanry. His first published work of ornithology was derived from observations he made of the birds of the in north-east Greece made during the time of this conflict.