William Weekes Fowler (January 1849 – 3 June 1923 ) was an English clergyman and entomologist mainly interested in beetles.
Son of the Reverend Hugh Fowler, Vicar of Barnwood, Gloucestershire, Fowler was educated at Rugby School and at Jesus College, Oxford. He became a Master at Repton School in 1873 and was ordained in 1875. In 1880 he became Headmaster of Lincoln Grammar School. This post was relinquished after twenty years. He was then Rector of Rotherfield Peppard, near Henley, Oxfordshire, for three years. He died Vicar of St Peters, Earley.
Fowler's other offices were: Canon of Welton Brinkhall at Lincoln (1887), President of the Headmasters Association (1907), Vice President of the Linnean Society (1906–1907), Member of the Scientific Committee of the Royal Horticultural Society, and Member of the Reading Guardians.
Fowler was first interested in Lepidoptera, then Coleoptera. His expertise in this order led to the publication of the first volume of The Coleoptera of the British Islands (1887–1891, 1913) and to his being appointed Secretary of the Royal Entomological Society, a post which he held for ten years, before, in 1901, he was made President. He was also for 38 years on the editorial panel of the Entomologist's Monthly Magazine. The Coleoptera lists two more genera and fifty more species than appear in H.E. Cox's Handbook, published some thirteen years earlier.
Fowler wrote the introductory volume and account of the Cicindelidae and Paussidae of The Fauna of British India, Including Ceylon and Burma; a contribution to Wytsman's Genera Insectorum on the Languriidae; the sections on Homopterous insects (except the Cicadidae, Fulgoridae, Coccidae and Aleurodidae) for Godman and Salvin's Biologia Centrali-Americana; and two Catalogues of the British fauna, compiled with A. Matthews in 1883 and with David Sharp in 1893. The last is an updated version of Sharp's earlier lists of 1871 and 1883.