Sorrel (Rumex acetosa) is a perennial herbaceous plant in the family Polygonaceae. It is also called common sorrel, meadow sorrel, green sorrel, sour dock, spinach dock and narrow-leaved dock ("dock" often used for the genus).

The species is native to Eurasia and a common wild plant in grassland habitats. It is often consumed as a leaf vegetable or herb, and has a cultigen, called Rumex rugosus and garden sorrel, that is typically the taxon found in gardens and sold by commercial suppliers.