Propanediol may refer to any of four isomeric organic chemical compounds:

Non-geminal diols (glycols)

• 1,2-Propanediol (propylene glycol), a vicinal diol

• 1,3-Propanediol (trimethylene glycol)

Geminal diols

• 1,1-Propanediol

• 2,2-Propanediol