The third season of Australian reality television series Lego Masters premiered on the Nine Network on 19 April 2021.Hamish Blake returned as host along with Ryan "The Brickman" McNaught as judge. Auditions for the third season opened in May 2020 asking for applicants 15 years old and above.In early September 2020, it was confirmed the third season would begin filming on Monday, October 5 at Melbourne Showgrounds. On 16 September 2020, the third season was officially confirmed at Nine's 2021 upfronts.