Korsakov, sometimes spelled as Korsakoff (Russian: Корсаков), or Korsakova (feminine; Корсакова), is a Russian last name and may refer to:
- People
- 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
- Other
- Korsakov (town), a town in Sakhalin Oblast, Russia