Fenoprop, or 2-propionic acid, is an herbicide and a plant growth regulator. The name Silvex is used in the USA. The name 2,4,5-TP is used in France and was used in the former USSR (2,4,5-ТП).

Fenoprop was once used as an herbicide for control of woody plants and broadleaf weeds. Fenoprop has been banned from use as an herbicide in the United States since 1985.