Natural Gas Liquids or NGL's are a mixture of light hydrocarbons (organic compound containing carbon and hydrogen atoms) that are gaseous at reservoir temperatures but separated as liquids from the gas through the process of condensation. They are byproducts of petroleum refining and the manufacturer of natural gasoline. They are used as feedstocks in petrochemical and refining industries and as an industrial, commercial and residential fuel.

NGL mixes can be further separated or "fractionated" to recover purity products, known collectively as LPG's, LP Gas or Liquefied Petroleum Gas: ethane, propane, butanes, natural gas.