Charles Edward Howard Aiken (7 September 1850 – 15 January 1936) was an American naturalist and ornithologist who was among the early ornithologists who studied the birds of Colorado. Lacking a university education, but trained as a skilled specimen preparator, he established a taxidermy business and later a museum. The subspecies Junco hyemalis aikeni and Megascops kennicottii aikeni are named after him.