Wilfrid Backhouse Alexander (4 February 1885 – 18 December 1965) was an English ornithologist and entomologist. He was a brother of Horace Alexander and Christopher James Alexander.
Alexander was born at Croydon in Surrey, England in 1885, and was introduced to natural history by his two uncles, James and Albert Crosfield. He was educated at Bootham School[1] in York and Tonbridge School in Kent, and went on to study Natural Science at Cambridge University. During this time his main interest was botany, graduating in 1909 with first class honours.