The Kadalundi Bird Sanctuary lies in the Malappuram District of the state of Kerala in India. It spreads over a cluster of islands where the Kadalundipuzha River flows into the Arabian Sea. The Sanctuary hill is around 200 m above sea level. It is 19 km from Kozhikode city centre. The nearest airport is Karipur International Airport, Kozhikode.
Over a hundred species of native birds have been recorded in the sanctuary, including about 60 species of migratory birds which visit seasonally; these include terns, gulls, herons, sandpipers and cormorants. Notable species are whimbrels and brahminy kites. The sanctuary is well known for a wide variety of fish, mussels and crabs.