Borax is Sodium borate, a boron-containing mineral.

Borax may also refer to:

• Borax (mineral), the naturally occurring mineral
• Borax, Nevada, a ghost town in the United States
• Sodium perborate, another boron-containing mineral.
• BORAX experiments, a series of tests using the BORAX-I nuclear reactor
• Pacific Coast Borax Company

• Borax Smith, Francis Marion Smith, an American business magnate
• 20 Mule Team Borax
• Borex, municipality in the canton of Vaud, Switzerland