The present page holds the title of a primary topic, and an article needs to be written about it. It is believed to qualify as a broad-concept article. It may be written directly at this page or drafted elsewhere and then moved to this title. Related titles should be described in 2003–04 Southern Hemisphere tropical cyclone season, while unrelated titles should be moved to 2003–04 Southern Hemisphere tropical cyclone season (disambiguation).

The 2003–04 Southern Hemisphere tropical cyclone season comprises three different basins. Their respective seasons are:

• 2003–04 South-West Indian Ocean cyclone season west of 90°E,
• 2003–04 Australian region cyclone season between 90°E and 160°E, and
• 2003–04 South Pacific cyclone season east of 160°E.

In addition to the three basins, there were two cyclones that developed in the south Atlantic Ocean. One weak cyclone developed in January and another in March which reached hurricane intensity and hit Brazil, known as Hurricane Catarina.

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