Sergei Anatolyevich Starostin (Russian: Серге́й Анато́льевич Ста́ростин; March 24, 1953 – September 30, 2005)[1] was a Russian historical linguist and philologist, perhaps best known for his reconstructions of hypothetical proto-languages, including his work on the controversial Altaic theory, the formulation of the Dené–Caucasian hypothesis, and the proposal of a Borean language of still earlier date.

He developed the hypothesis, originated by Abu al-Ghazi Bahadur Khan in the 17th century, but really revived by Gustaf John Ramstedt in the early 20th century, that Japanese is related to the Turkic and Mongolic languages through an "Altaic" family.

Since 1985, Starostin had been developing STARLING,[2] a database management system designed for his Tower of Babel [ru] website.

[4] At the time of his death, he was a professor at the Russian State University for the Humanities, a visiting professor at the Santa Fe Institute, and a frequent guest lecturer at Leiden University in the Netherlands, where he was awarded the degree of doctor honoris causa in June 2005.

Starostin died of a heart attack on September 30, 2005, in Moscow after a lecture at the Russian State University for the Humanities.