3 February – Paul Keane was ready to get axed from his long-running role as Des Clarke in Neighbours, but has instead opted to take a four-month hiatus and was expected to return in April. Keane's break from the show comes as cast morale is at an all-time low following the departure of several key cast members, but producers are confident that Des will return with some good storylines.
20 February – In Neighbours, Toby & Noelene Mangel depart.
23 February – In Neighbours, this was Bronwyn Davies' final episode.
28 February – In Neighbours, this was Hilary Robinson's final episode.
31 March – Neighbours Producers have chosen to write out the popular character of Sharon Davies – the on-screen sister to Rachel Friend's former character Bronwyn Davies, played by 19-year-old Jessica Muschamp said the exit of Neighbours may have been a "blessing in disguise." She finished her final credits in Neighbours in five weeks and after leaving the series, she went to English pantomime performances over Christmas and was considering mini-series and theatre roles in Australia.
April – Jennifer Keyte becomes the first solo woman newsreader on a commercial network in Australia when Glenn Taylor leaves the Melbourne beurau of Seven News.
9 June – Neighbours star Linda Hartley has decided to leave the hit-turned-troubled 10 TV Australia soap opera after a behind-the-scenes battle between producers Grundy Television and 10 TV Australia. Hartley had requested for a hiatus from the series to allow time to travel overseas and to pursue an opportunity for a singing career including a recording contract with Sony Music Australia, but Grundys were not keen to renew her contract, claiming the show had exceeded its casting budget. However, budget cuts ran out, negotiations broke down again and Hartley has chosen to leave the series.
5 September – In Neighbours, this was Beverly Robinson's final episode.
7 September – In Neighbours Kerry Mangel was shot in the head while duck hunting by Mick Taylor, leaving Joe Mangel in Saw-styled screaming and crying. This was the final episode.
10 October – In Neighbours, this was Des Clarke's final episode.
11 November – Australian comedy series The Comedy Company airs its final episode on 10 TV Australia before getting axed after very bad ratings and failed to match the success of its 1988 season.
December – The Seven Network wins the 1990 ratings year with a record of 35.6% share for Total People. The most watched program was Seven's AFL: 1990 AFL Grand Final.
8 December – Neighbours producers have announced that star Ashley Paske will not renew his contract with the troubled 10 TV Australia soap opera when it expires in January. He is expected to be seen on-air until May.
9 December – 1990 Neighbours movie-length finale: Joe Mangel snatches Sky Bishop from Eric Jensen (episode 1), Joe & Toby Mangel are arrested for shoplifting and kidnapping Sky Bishop, Paul Robinson proposes to Chrstina Aleesi, Glen Donnolly arrives and tells that Jim Robinson is his father (episode 3).
21 December – James Valentine presents the Australian weekday afternoon magazine series The Afternoon Show for the last time at 5:00 pm. The programme includes reruns of the French-American-Canadian animated series Inspector Gadget and Canadian action drama series Danger Bay (Both these shows haven't been airing on the ABC for a long time since most of the year).
22 December – Neighbours star Richard Norton has been informed by producers that they won't be renewing his contract with the troubled 10 TV Australia soap opera when it expires in February.
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.