2022–23 South-West Indian Ocean cyclone season

The 2022–23 South-West Indian Ocean cyclone season was one of the deadliest South-West Indian cyclone seasons on record, mostly due to Cyclone Freddy. It officially began on 15 November 2022, and ended on 30 April 2023, with the exception for Mauritius and the Seychelles, for which it ended on 15 May 2023. 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. However, tropical cyclones can form year-round, and all tropical cyclones that form between 1 July 2022 and 30 June 2023 will be part of the season. Tropical and subtropical cyclones in this basin are monitored by the Regional Specialised Meteorological Centre in Réunion and unofficially by the Joint Typhoon Warning Center.

The season was average in terms of the number of systems that formed, with nine systems becoming at least moderate tropical storms, and six reaching tropical cyclone strength. Activity began early, with the first two systems (Ashley and Balita) developing in September and October, and ended late with Fabien in May. The season featured Cyclone Freddy, which became the longest-lived tropical cyclone on record, beating the previous record of Hurricane John in 1994, and also had the highest accumulated cyclone energy (ACE) of any tropical cyclone on record worldwide, surpassing Hurricane Ioke in 2006. In addition, Freddy is the only known tropical cyclone to achieve seven separate rapid intensification cycles. The most intense system of the season was Cyclone Darian.

In the month of January, Cyclone Cheneso brought flooding and strong winds to Madagascar. In May, Cyclone Fabien formed close to the equator and became the latest intense tropical cyclone in the satellite era, surpassing Cyclone Billy-Lila of 1986 by six days. Tropical cyclones during this season collectively caused at least 1,483 deaths and more than $675 million in damage.