Miroslav Zei (25 July 1914 – 2 November 2006) was a Slovene biologist, specialist in marine biology, oceanography and ichthyology.
He specialized at the Oceanographic Institute in Split from 1937 to 1941 where he was also an assistant until 1941 and then senior scientific researcher until 1948 when he was appointed professor at the University of Ljubljana.
He lectured until 1962 and then joined a United Nations FAO oceanographic project and worked in Ghana, Tunisia and the Western African coast from Morocco to Zaire until 1975.
He wrote numerous scientific texts but also a number of popular science books.
He won the Levstik Award twice, in 1952 for his book Iz ribjega sveta (The World of Fish) and in 1957 for Iz življenja sesalcev (The Lives of Mammals).