The Queen's Birthday Honours for 2021 are appointments by some of the 16 Commonwealth realms of Queen Elizabeth II to various orders and honours to reward and highlight good works by citizens of those countries. The Birthday Honours are awarded as part of the Queen's Official Birthday celebrations during the month of June. The honours for New Zealand were announced on 7 June.

Below are the individuals appointed by Elizabeth II in her right as Queen of the United Kingdom with honours within her own gift, and with the advice of the Government for other honours.

The 2021 Queen's Birthday Honours for Australia were announced on 14 June 2021 by the Governor-General, David Hurley.

The 2021 Queen's Birthday Honours for New Zealand were announced on 7 June 2021.

Below are the individuals appointed by Elizabeth II in her right as Queen of the Cook Islands, on the recommendation of the Ministers of the Cook Islands.

Below are the individuals appointed by Elizabeth II in her right as Queen of the Commonwealth of The Bahamas, on the advice of Her Majesty's Bahamas Ministers.

Below are the individuals appointed by Elizabeth II in her right as Queen of Grenada, on the advice of Her Majesty's Grenada Ministers.

Below are the individuals appointed by Elizabeth II in her right as Queen of Solomon Islands, on the advice of Her Majesty's Solomon Island Ministers.