Korsakov, sometimes spelled as Korsakoff ({{lang-ru|Ко́рсаков}}), or Korsakova (feminine; Ко́рсакова), is a Russian surname. Notable people with the surname include:

• Alexander Dondukov-Korsakov (1820–1893), Russian knyaz, cavalry general, Imperial Commissioner in Bulgaria
• Andrey Korsakov (1916–2007), Russian and Ukrainian linguist and language philosopher
• Alexander Rimsky-Korsakov (1753–1840), infantry general
• Andrey Rimsky-Korsakov (1878–1940), Russian musicologist, son of the composer Nikolai Rimsky-Korsakov
• Dmitry Korsakov (1843–1920), Russian historian
• Nikolai Rimsky-Korsakov (1844–1908), Russian composer
• Pyotr Korsakov (1790–1844), Russian writer
• Semen Korsakov (1788–1853), Russian homeopath and inventor
• Sergei Korsakoff (1854–1900), Russian neuropsychiatrist
  • Korsakoff's syndrome, a brain disease caused by chronic alcoholism named after Sergei Korsakoff

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