Beryl Iris Brewin (10 September 1910 – 8 January 1999) was a New Zealand marine zoologist, specialising in ascidians (sea squirts).

[1] She graduated from Auckland University College in 1931 with a Bachelor of Science in botany and zoology.

[5] Brewin submitted her Doctor of Science thesis, consisting of 18 papers published between 1942 and 1957 to the University of New Zealand in 1958.

[7] In 1954, Brewin was the second woman to be appointed to the Council of the Royal Society Te Apārangi, after her colleague Marion Fyfe, also from the Department of Zoology at Otago.

[9] She also bequeathed $1 million for the purchase of a research vessel, the 10 metres (33 ft) RV Beryl Brewin in her honour.