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Green diesel, also known as renewable diesel, is a form of diesel fuel which is derived from renewable feedstock rather than the fossil feedstock used in most diesel fuels. Green diesel is not to be confused with biodiesel which is chemically quite different and processed using transesterification rather than the traditional fractional distillation used to process green diesel.

Green diesel feedstock can be sourced from variety oils including canola, algae, jatropha and salicornia in addition to tallow.

Technology
At this stage the only commercial scale green diesel refinery process is the UOP/Eni "Ecofining" process.