2021 in Australian television

This is a list of Australian television-related events, debuts, finales, and cancellations that are scheduled to occur in 2021, the 66th year of continuous operation of television in Australia.

Affiliation changes

 * 1 July – Nine Network programming to air on WIN Television owned and operated stations (excluding NRN)
 * 1 July – Network Ten programming to air on Southern Cross Austereo owned and operated stations.

Changes to network affiliation
Criterion for inclusion in the following list is that Australian premiere episodes will air in Australia for the first time on a new channel. This includes when a program is moved from a free-to-air network's primary channel to a digital multi-channel, as well as when a program moves between subscription television channels – provided the preceding criterion is met. Ended television series which change networks for repeat broadcasts are not included in the list.

Free-to-air premieres
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.

Subscription premieres
This is a list of programs which made their debut on Australian subscription television, having previously premiered on Australian free-to-air television. Programs may still air (first or repeat) on the original free-to-air television network.

Returning programs
Australian produced programs which are returning with a new season after being absent from television from the previous calendar year.

a Was originally due to premiere on 4 May 2021, but was delayed by three weeks due to a tight production schedule.