The 33rd century BC is a century which lasted from the year 3300 BC to 3201 BC.
The sun shines over Saharan dunes
- Major climate shift possibly due to shift in solar activity. Glaciers expand, covering plants. Atmospheric temperatures fall.
- Sahara changes from a habitable region into a barren desert
- Ancient Egypt begins using clay, bone and ivory tags to label boxes, possibly an example of proto-writing
- Indus Valley Civilization (also known as Harappan civilization or Sindu-Sarasvati civilization) began in Harappa
- c. 3300 BC, Harappan script was discovered in Indus Valley (present day Pakistan)
- c. 3300 BC—Pictographs in Uruk
- 3300 BC – 3000 BC: Face of a woman, from Uruk (modern Warka, Iraq) is made. It is now in the Iraq Museum, Baghdad (stolen and recovered in 2003).
- c. 3300 BC The Red Temple, the first phase of the Monte d'Accoddi sanctuary in Northwest Sardinia, is built. Now is visible into the interior of the second phase temple.
- Death of 'Ginger', the earliest known ancient Egyptian mummified figure
Inventions, discoveries, introductions 
Religion and mythology 
Significant people 
- Ötzi the Iceman, a mummy discovered in the Austrian/Italian Alps in 1991.
Decades and years