Charles Atwood Kofoid (11 October 1865 – 30 May 1947) was an American zoologist known for his collection and classification of many new species of marine protozoans which established marine biology on a systematic basis.

[1] In 1920, Kofoid and US zoologist Olive Swezy (1873-1968),[3] published Pavillardia Kof.

[5] They also published Gyrodinium, which is a genus of dinoflagellates belonging to the order Gymnodiniales in 'Memoirs of the University of California'.

[6] In 1929, botanist Pavillard first described Kofoidinium, which is a genus of dinoflagellates belonging to the family Kofoidiniaceae.

[7] Kofoid was elected to the American Academy of Arts and Sciences in 1913,[8] the United States National Academy of Sciences in 1922,[9] and the American Philosophical Society in 1924.