13 January – Network Ten undergoes a major rebrand, launching as "The Entertainment Network" and introducing a new logo, which remained in use until October 2018.
17 January – Seven Network's long running breakfast program Sunrise makes its first broadcast.
8 February – French-American-Canadian animated series Inspector Gadget ends its afternoon run on ABC. The series will later shift to air on Sunday mornings on 22 December of that year.
16 March – The producers of soap opera Neighbours have reported that star Beth Buchanan (sister of ex-Hey Dad star Simone) is going to leave the series when her contract expires in June.
17 March – ABC debuts a new Sunday morning children's wrapper program called Couch Potato presented by Australian actor Grant Piro.
April – Glenn Ridge and Jo Bailey replace Tony Barber and Alyce Platt on Sale of the Century.
6 April – Network Ten's troubled soap opera Neighbours is set to lose a record number of cast members as many of them have contract renewals coming up. Ian Williams, who plays medical student Adam Willis, is confirmed to be leaving, while co-star Lucinda Cowden who plays Melanie Pearson is also believed to be quitting when their contracts expire.
30 April – ABC's live comedy series The Big Gig returns with a new series.
15 May – Canadian teen drama series Degrassi High, the third in the Degrassi trilogy series makes its debut on ABC.
30 May – Australian sitcom All Together Now premieres in New Zealand, screening on Channel 2.
30 May – A spinoff of the Australian comedy series Hey Dad...! called Hampton Court airs on Seven Network running for only one season and a total of thirteen episodes. It was later axed after the final episode on 22 August.
4 July – British long running soap opera series EastEnders airs on ABC for the very last time due to the show not getting any more episodes from the UK[citation needed] where it originally came from, although it was later repeated on UKTV on cable television.
16 July – Australian live comedy series The Big Gig airs its final episode on ABC.
30 July – Johnson and Friends makes it debut in the UK on the BBC.
August
9 August – Final episode of the Australian children's sitcom Pugwall screens on Nine Network.
13 August – Australian children's series Adventures on Kythera premiers on the Nine Network, its first broadcast in Australia. The series debuted in the UK and Ireland two years ago.
7 September – Neighbours star Richard Huggett, who plays Jim Robinson's half-son Glen Donnelly has told producers that he will not be renewing his contract when it expires in November. He will be seen on air until February 1992.
7 September – Johnson and Friends premieres in South Africa on M-Net as part of their children's block K-T.V..
19 September – Network Ten's shamed soap opera Neighbours airs a tragic episode: Joe Mangel proposes to Melanie Pearson announce they will immigrate to the UK, Adam Willis leaves Ramsay Street for Europe, Harold Bishop is murdered off the coast while on holidays with Madge to Tasmania – this was the final episode.
October
25 October – In Neighbours, Joe Mangel, Melanie Pearson and Sky Bishop depart.
30 October – The second series of Johnson and Friends debuts at 4:30pm on ABC.
November
5 November – The hit long running British science fiction series Doctor Who returns on ABC after a long absence since its last air in mid 1990, starting off with the fourth serial of Season 17Nightmare of Eden and ending with the seventh and final serial of Season 18Logopolis in early 1992. A convention of the series is also being held at the local Noah's on the Beach hotel in Newcastle, New South Wales.
6 November – Johnson and Friends begins airing in Ireland on RTÉNetwork 2 as part of The Den, a wrap-around programme for children.
December
December – The Seven Network wins the 1991 ratings year with a record of 33.8% share for Total People. This is the fifth consecutive year the network had won in primetime.
19 December – Australian children's television series Johnson and Friends is sold to television markets across Canada for the first time ever. The first television channel to air the series in Canada was Knowledge Network in British Columbia.
22 December – Inspector Gadget returns to the ABC after a very long absence with the series now broadcasting every Sunday morning.
27 December – Australian children's series Fat Cat and Friends airs on Seven Network for the very last time. The series was then cancelled due to the Australian Broadcasting Tribunal claiming that it was not educational enough and not clearly defined and it will might confuse young children.
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.
