The 1972–73 Australian region cyclone season was an above-average tropical cyclone season, in terms of activity. Additionally, it is also the deadliest tropical cyclone season recorded in the Australian region, with Cyclone Flores killing an estimated 1,650 people alone, making Flores the single-deadliest tropical cyclone recorded in the entire Southern Hemisphere.
Tropical Cyclone Ivy developed over the eastern Indian Ocean on December 7. The cyclone entered the southwest Indian Ocean basin after crossing 80°E and was renamed Beatrice.
At Wickham on 21 January 1973 more than 30 houses were partly unroofed and some houses received major damage. There was no damage to buildings in Dampier, Roebourne or Karratha as the cyclone crossed the coast well to the east. Kerry passed close to a number of oil-drilling rigs causing damage and lost productivity time that cost over one million dollars. Maximum recorded gust was 140 km/h at Cape Lambert.
Tropical Cyclone Leila-Gertrude
Tropical Cyclone Leila formed offshore Western Australia on January 21. Moving generally westward, the storm crossed 80°E on January 23 and was renamed Gertrude.
Tropical Cyclone Adeline developed in the Gulf of Carpentaria on January 27. Moving south-southwestward, Adeline made landfall near the Northern Territory-Queensland border, shortly before dissipating on January 29.
Tropical Cyclone Maud
Tropical Cyclone Maud existed offshore Western Australia from January 28 to January 31.
Tropical Cyclone Kristy
Tropical Cyclone Kristy developed southwest of the Solomon Islands on February 24. Heading generally southward, Kristy dissipated well east of New South Wales on March 1.
Severe Tropical Cyclone Leah
The next system, Cyclone Leah, formed near the coast of Western Australia on February 27. Moving southwestward, Leah eventually dissipated on March 11.
Severe Tropical Cyclone Madge
Cyclone Madge originated in the vicinity of the Solomon Islands on February 28. Tracking west-southwestward, Madge struck the Cape York Peninsula early on March 4. By late the following day, the cyclone made landfall near Numbulwar, Northern Territory. Moving across Northern Territory and Queensland, Madge emerged into the Indian Ocean on March 10. The storm headed generally westward for the next several days, until dissipating on March 18.
Severe Tropical Cyclone Nellie
On March 13, Cyclone Nellie formed offshore Queensland. It moved generally west-southwestward before dissipated on March 23.
Cyclone Bella developed over the Arafura Sea on March 20. It struck North Territory before dissipating on March 25.
Tropical Cyclone Paula
The next system, Cyclone Paula, formed southwest of Indonesia on March 26. Paula moved southwestward and dissipated about six days later.
Tropical Cyclone Roma
Cyclone Roma existed from April 18 to April 23.
Cyclone Flores
The strongest tropical cyclone of the season developed in the Banda Sea on April 26. The storm peaked with a barometric pressure of. The storm struck the island of Flores before dissipating on April 29. Widespread destruction of houses, schools, and bridges was reported in four of the island's districts. 53 on Flores were killed, and 21 perished in the sinking of a Timorese fishing ship, the Oarbiru. Additionally, over 1,500 fisherman were reported lost at sea. The area's remoteness kept information about the cyclone's effects from reaching the news for over a month. The storm killed a total of 1,650 people, making it the deadliest tropical cyclone recorded in the Southern Hemisphere.
Severe Tropical Cyclone Marcelle
Marcelle, the final tropical cyclone of the season, developed well west of Indonesia on April 29. The storm struck near Busselton, Western Australia late on May 7. Marcelle dissipated well south of Australia about two days later.