Editing 1891 in science (section)

==Births==
* January 8 – [[Walther Bothe]] (died [[1957 in science|1957]]), German physicist, winner of the [[Nobel Prize in Physics]]  ([[1954 in science|1954]]).
* January 26 – [[Wilder Penfield]] (died [[1976 in science|1976]]), American-born [[neurosurgeon]].
* April 22 – [[Harold Jeffreys]] (died [[1989 in science|1989]]), [[English people|English]] [[mathematician]].
* May 15 – [[Fritz Feigl]], (died [[1971 in science|1971]]), Austrian-born Brazilian  chemist
* July 5 – [[John Howard Northrop]] (suicide [[1987 in science|1987]]), [[Americans|American]] [[biochemist]], winner of the [[Nobel Prize in Chemistry]] ([[1946 in science|1946]])
* July 27 – [[Jacob van der Hoeden]], Dutch-Israeli veterinary scientist (died [[1968 in science|1968]])
* August 17 – [[Aly Tewfik Shousha]] (died [[1964 in science|1964]]), [[Egyptians|Egyptian]] [[bacteriologist]].
* September 14 – [[Ivan Matveyevich Vinogradov]] (died [[1983 in science|1983]]), [[Russia]]n mathematician.
* September 24 – [[William F. Friedman|W. F. Friedman]] (died [[1969 in science|1969]]), [[Bessarabia]]n-born [[cryptanalyst]].
* October 24 – [[Ernest Melville DuPorte]] (died [[1981 in science|1981]]), [[Caribbean]]-born Canadian [[Insect morphology|insect morphologist]].
* November 14 – [[Frederick Banting]] (died [[1941 in science|1941]]), [[Canadians|Canadian]] discoverer of [[insulin]], winner of the [[Nobel Prize in Physiology or Medicine]] ([[1923 in science|1923]]).