Iffley Meadows is a 36.1-hectare (89-acre) biological Site of Special Scientific Interest in Oxford in Oxfordshire.

[1][2] It is owned by Oxford City Council and managed by the Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust[3] These flood meadows on Iffley Island, between two arms of the River Thames, are traditionally managed for hay and pasture.

A large part of the site is on clay, and it is enriched by silt each year when it is flooded.

There is a rich grassland flora, with the outstanding feature being 89,000 snake's head fritillaries, which produce purple flowers in the spring.

There is a network of old river channels, ditches and overgrown hedges.