Letters and Numbers is an Australian game show on SBS. It is hosted by former newsreader Richard Morecroft, co-hosted by David Astle and Lily Serna. Although it is based on the French game show Des chiffres et des lettres, its structure is similar to the UK version of the show, Countdown - with the titular difference being used to avoid confusion with the Australian music program Countdown.

The series began airing on 2 August 2010. On 22 June 2012 SBS announced its decision to "rest" the show and the final episode aired on 27 June 2012. Repeat episodes were still regularly shown on SBS as of 2023.

On 5 July 2021, SBS announced that Letters and Numbers would be revived in a new series hosted by comedian, journalist and actor Michael Hing. On 3 September 2021, it was revealed that the revival would be a celebrity version of the show, entitled Celebrity Letters and Numbers, and that David Astle and Lily Serna would return to co-host the series which premiered on 2 October 2021.