John Spangler Nicholas

John Spangler Nicholas
BornMarch 10, 1895
DiedSeptember 11, 1963 (aged 68)
Academic background
EducationGettysburg College (BS, MS)
Yale University (PhD)
Doctoral advisorRoss Granville Harrison
Academic work
DisciplineZoology
Sub-disciplineEmbryology
InstitutionsUniversity of Pittsburgh
Yale University

John Spangler Nicholas (March 10, 1895 – September 11, 1963) was an American embryologist and a professor of zoology at Yale University. He contributed to experimental techniques for the study of embryology through transplants, the early stage development of teleost and mammalian zygotes.