10 February – 5 years since the last show, Ray Martin returns to the hosting role on Nine's A Current Affair.
17 March – Seven launches a new news bulletin at 4:30 pm, titled Target Iraq, detailing the latest developments on the war in Iraq. After the invasion concludes, the bulletin is retained and is renamed Seven 4.30 News (later Seven Afternoon News), with production moving to Melbourne before it is moved back to Sydney in 2006, where it remains as of today.
25 June – Neighbours producers has announced that star Delta Goodrem will not renew her contract with the Network Ten series when it expires in next month. She is expected to be seen on-air until September.
27 June – Network Ten axes vintage episode reruns of Neighbours earlier through the 1991 series after very bad ratings and on the following Monday June 30, TEN launches the one-hour afternoon news bulletin instead. In 2002 Neighbours rated only 70,000 viewers during the whole 1990 series.
30 June – Two of the ABC's digital television service channels ABC Kids and Fly TV closed down due to funding cuts from the Federal Government.
28 September – Shaun Faulkner wins the fourth season of The Mole, taking home $104,000 in prize money. Petrina Edge is revealed as the Mole, and Nathan Beves is the runner-up.
10 October – After protests from the community during the Vietnam War, SBS TV has chosen to cancel its broadcasts of the state-run news service across Vietnam.
23 October – Axed-Neighbours star Delta Goodrem wins the GOLD ARIA for Single of the Year at the 2003 ARIA Awards, along with 6 trophies, including John Farnham being inducted to the Hall of Fame and blasted the speakers loud to 1985's "You're The Voice".
19 November – The first series of Australian Idol was won by Guy Sebastian defeating Shannon Noll, along with his very first single, Angels Brought Me Here debuting at #1 on the ARIA Top 50 singles and Video Hits Top 20 singles chart reaching 4 time Platinum and album Just as I Am debuted at #1 and was reached 6 times Platinum. In 2010, Angels Brought Me Here ranked #1 on the ARIA end of decade singles chart.
22 December – Australian children's comedy series The Ferals returns to air on ABC after a very long absence since 1995. Rather than airing in the afternoons on Mondays at 5:00pm, the series now airs at 11:20am weekday mornings.
December – Nine Network takes a new record as the network wins all 40 weeks of ratings.
This is a list of programs which made their premiere on an Australian television network that had previously premiered on another Australian television network. The networks involved in the switch of allegiances are predominantly both free-to-air networks or both subscription television networks. Programs that have their free-to-air/subscription television premiere, after previously premiering on the opposite platform (free-to air to subscription/subscription to free-to air) are not included. In some cases, programs may still air on the original television network. This occurs predominantly with programs shared between subscription television networks.
This is a list of programs which made their premiere on Australian free-to-air television that had previously premiered on Australian subscription television. Programs may still air on the original subscription television network.
This is a list of programs which made their premiere on Australian subscription television that had previously premiered on Australian free-to-air television. Programs may still air on the original free-to-air television network.