Purex may refer to:

• PUREX (plutonium uranium reduction extraction), a reprocessing process for spent nuclear fuel

• Purex (laundry detergent), a brand of detergent

• Purex Crystals, a laundry fragrance booster

• Toilet tissue brand by Kruger Inc.

• Purex (earwig), a genus of earwigs in the subfamily Spongiphorinae