Sergei Nikolaev
Sergei Nikolajew is the name of the following people:
- Sergei Nikolajew (athlete) (born 1966), Russian shot putter
- Sergei Alexejewitsch Nikolajew (* 1946), Russian ice hockey coach
- Sergei Gennadjewitsch Nikolajew (* 1972), Russian ice hockey goalkeeper
- Sergei Sergejewitsch Nikolajew (1946–2016), Soviet or Russian actor
- Sergei L. Nikolajew (* 1954), Russian linguist