Nicolai may refer to:
*
Nicolai (given name) people with the forename ''Nicolai''
*
Nicolai (surname) people with the surname ''Nicolai''
*
Nicolai (crater), a crater on the Moon
See also
*
Niccolai, a surname
*
Nicolae (disambiguation)
*
Nicolao
*
Nicolay (disambiguation)
*
Nikolai (disambiguation)
*
Nikolay (disambiguation)
Nikolai or Nikolay is an East Slavic variant of the masculine name Nicholas. It may refer to:
People Royalty
* Nicholas I of Russia (1796–1855), or Nikolay I, Emperor of Russia from 1825 until 1855
* Nicholas II of Russia (1868–1918), or Niko ...
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