Nicholas Sims-Williams, FBA (born 11 April 1949, Chatham, Kent) is a British professor of the School of Oriental and African Studies (SOAS), University of London, where he is Emeritus Professor of Iranian and Central Asian Studies at the School of Languages, Cultures and Linguistics, Centre for Iranian Studies. Sims-Williams is a scholar who specializes in Central Asian history, particularly the study of Sogdian and Bactrian languages. He is also a member of the advisory council of the Iranian Studies journal.

Sims-Williams recently worked on a dedicatory Sogdian inscription, dated to the 1st–3rd centuries CE, that was discovered at Kultobe in Kazakhstan. It alludes to military operations of the principal towns of Sogdiana against the nomads in the north. The inscription tends to confirm the confederational organization of the Kangju state and its various allies that was known previously from the Chinese texts.