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