The name Drena has been used for two tropical cyclones in the South Pacific region of the Southern Hemisphere:
The 1996–97 South Pacific cyclone season was one of the most active and longest South Pacific tropical cyclone seasons on record, with 12 tropical cyclones occurring within the South Pacific basin between 160°E and 120°W. The season officially ran from November 1, 1996 - April 30, 1997, however, the season ended later than normal with three systems monitored after the official end of the season. The strongest tropical cyclone of the season was Cyclone Gavin which had a minimum pressure of 925 hPa (27.32 inHg). After the season had ended 4 tropical cyclone names were retired from the naming lists, after the cyclones had caused significant impacts to South Pacific islands.
The 1984–85 South Pacific cyclone season was an above-average tropical cyclone season, with nine tropical cyclones occurring within the basin between 160°E and 120°W. The season ran from November 1, 1984, to April 30, 1985, with tropical cyclones officially monitored by the Fiji Meteorological Service (FMS), Australian Bureau of Meteorology (BoM) and New Zealand's MetService. The United States Joint Typhoon Warning Center (JTWC) and other national meteorological services including Météo-France and NOAA also monitored the basin during the season. During the season there was nine tropical cyclones occurring within the basin, including three that moved into the basin from the Australian region. The BoM, MetService and RSMC Nadi all estimated sustained wind speeds over a period of 10-minutes, which are subsequently compared to the Australian tropical cyclone intensity scale, while the JTWC estimated sustained winds over a 1-minute period, which are subsequently compared to the Saffir–Simpson hurricane wind scale (SSHWS).
Severe Tropical Cyclone Drena was a powerful tropical cyclone that caused significant damage throughout New Zealand. A tropical depression formed on January 2, 1997. After crossing Vanuatu and emerging into the Coral Sea, the storm began to intensify, and by January 6, had attained peak intensity. After attaining peak intensity, Drena began to weaken. Cyclone Drena later brushed New Caledonia, bringing some damage. After transitioning into an extratropical cyclone on January 9, Drena brought impact to New Zealand. Damage totaled to $6.7 million and 3 people were killed. Roughly 140 people were evacuated after 44 homes were flooded. After the season, Drena was retired.