This timeline documents all of the events of the 2009–10 South Pacific cyclone season which is the period that tropical cyclones formed in the southern Pacific Ocean.

The scope of this article is limited to tropical cyclones that form in the Indian Ocean 160°E and 120°W to the south of the equator.

Should a tropical cyclone form to the west of 160°E then it will be monitored within the Australian region by the Australian Bureau of Meteorology, should a tropical cyclone form to the east of 120°W, it is unclear how it will be handled as no tropical cyclone has ever been observed in the South Pacific Ocean east of 120°W.

When a Tropical Disturbance forms or moves into the South Pacific, it is assigned a number and monitored by Météo-France who run the Regional Specialized Meteorological Center (RSMC) on Réunion Island.

The United States Joint Typhoon Warning Center (JTWC) also issue warnings on tropical cyclones in this region assigning a number with an "S" suffix.