1000 or thousand may refer to:
- 1000 (number), a natural number
- AD 1000, a leap year in the Julian calendar
- 1000 BC, a year of the Before Christ era
- 1000 metres, a middle-distance running event
- 1000°, a German electronic dance music magazine
- Thousand (comics), a Marvel Comics character
- "Thousand" (song), a song by Moby
- The Thousand (I Mille), the volunteers in the Expedition of the Thousand, a military action of the Italian Risorgimento, 1860