Sergei Nikolayev may refer to:
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Sergei Nikolayev (footballer), Russian football player
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Sergei Nikolayev (ice hockey), Russian ice hockey player
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Sergey Nikolaev (cyclist), Russian cyclist
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Sergey Nikolayev (shot putter) (born 1966), Russian shot putter
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Sergei Nikolaev (linguist)
Sergei Lvovich Nikolaev (russian: Серге́й Льво́вич Никола́ев; born 25 December 1954) is a Soviet and Russian linguist, specialist in comparative historical linguistics, Slavic accentology and dialectology. He is the autho ...
, Russian linguist
{{hndis, Nikolayev, Sergei