The 2021 Hastings Deering Colts season was the 4th season of the under-21 competition, sponsored by Hastings Deering and run by the Queensland Rugby League.

The draw and structure of the competition mirrors that of its senior counterpart, the Queensland Cup.

[2] The Sunshine Coast Falcons are the defending premiers, having won the competition in 2019 as the 2020 competition was cancelled due the COVID-19 pandemic.

[3] In 2021, the lineup of teams remains unchanged for the second consecutive year.

Source: [4] Former Top-Flight Competition: Brisbane Rugby League premiership