Louis Leon Arthur Mowbray (born 19 August 1877 on St. George's, Bermuda; died 5 June 1952) was a Bermudian naturalist.
In 1906, he observed a live Bermuda petrel of which he wrote the scientific description in 1916 together with John Treadwell Nichols.
Their son Louis Mowbray rediscovered the Bermuda petrel in 1951 together with Robert Cushman Murphy and David B. Wingate.
In 1923, he rejoined the staff of the New York Aquarium and in 1926 he returned to Bermuda.
In 1928 he became director of the Bermuda Aquarium, Museum and Zoo which he ran until 1944.