Nikolayev/Nikolaev (masculine) or Nikolayeva/Nikolaeva (feminine) may refer to:
Nikolayev (surname) (includes Nikolayeva and Nikolaeva) Nikolayev/Nikolaev, Russian spellings of Mykolaiv (disambiguation), several places in Ukraine Nikolayev (crater), a Moon crater
See also Mykolaiv, a city in Ukraine also known as Nikolayev Nikolaevo, a town in Stara Zagora Province, Bulgaria Nikolayevka (disambiguation) Nikolayevsk (disambiguation) Nikolayevsky (disambiguation)