Allan Riverstone McCulloch (20 June 1885 – 1 September 1925) was a prominent Australian ichthyologist.

Born in Sydney, Australia, McCulloch began his scientific career at the age of 13 as an unpaid assistant to Edgar Ravenswood Waite in the Australian Museum where Waite encouraged McCulloch to study zoology.

His major research interest was in fish, but he was also given the responsibility of the crustacean collection from 1905 to 1921, and he wrote several significant papers on decapods.

His collection ultimately included over 40,000 specimens, and he was considered "the greatest authority on fish in the southern hemisphere" (David Starr Jordan).

In 1930, A Check List of the Fishes Recorded from Australia, edited by Gilbert P. Whitley from McCulloch's materials was published as Memoir V of the Australian museum of Sydney.