Jakob Johan Adolf Appellöf (Garda on Gotland 2 November 1857 – Uppsala 5 January 1921) was a Swedish marine zoologist.

Appellöf matriculated at Uppsala University in 1877, earned his PhD in 1886 and became a docent of zoology in 1887.

In 1889 he received the position of conservator at the University Museum of Bergen.

With a donation from the sawmill magnate Bünsow, Appellöf established the Klubban Biological Station of Uppsala University, a station for the study of marine biology located on the west coast of Sweden.

This article contains content from the Owl Edition of Nordisk familjebok, a Swedish encyclopedia published between 1904 and 1926, now in the public domain.