Sergei Gavrilovich Navashin (Russian: Серге́й Гаврилович Навашин; 14 December 1857 – 10 December 1930) was a Russian Empire and Soviet biologist. He discovered double fertilization in plants in 1898.^[1]

1874 — enters the Medical Surgical Academy in St. Petersburg, works on chemistry in the laboratory of A. Borodin

1878 — moves to the Moscow University, obtains Candidate degree in 1881 in Biology. Under the influence of K. Timiryazev and V. Zinger starts to study Botany. Receives a position of a laboratory assistant at the chair of Plant Physiology and later (1885) in the Petrovskaya Agricultural Academy.

1894 — is invited to work at the chair of Systematics and Morphology of the Kiev University.

During 1894-1914 works as a director of the Botanical Garden of Kiev University

1896 — defends his doctoral thesis at Odessa University

1918-1923—professor of Tbilisi University (Georgia)

1923—founds the Timiryazev Biological Institute in Moscow. Heads it till 1929.

• Sergei Gavrilovich Navashin at www.cybertruffle.org.uk