The 2051–52 South-West Indian Ocean cyclone season was an ongoing event of the annual cycle of tropical cyclone and subtropical cyclone formation. It began on November 15, 2051, and ended on April 30, 2052, with the exception for Mauritius and the Seychelles, for which it will end on May 15, 2052. These dates conventionally delimit the period of each year when most tropical and subtropical cyclones form in the basin, which is west of 90°E and south of the Equator. Tropical and subtropical cyclones in this basin are monitored by the Regional Specialised Meteorological Centre in Réunion.