🇮🇪 5 January - Fiftieth anniversary of the admission of the Republic of Ireland to what was then the European Economic Community.
🇸🇭🇬🇧🇫🇰🇸🇭🇬🇸🇸🇭 15 February - Five British south Atlantic and Antarctic territories (Ascension Island, British Antarctic Territory, Falkland Islands, South Georgia And The South Sandwich Islands and Tristan Da Cunha) participate in a mini-omnibus issue to commemorate the late Queen Elizabeth II.
🇬🇧 23 March - Royal Mail issued its first commemorative stamps which included a cameo of King Charles III in their design.
🇬🇧 4 April - Royal Mail issued its first definitive stamps depicting a portrait of King Charles III.
🇫🇰🇸🇭🇬🇧 🇨🇦 6 May - Coronation of King Charles III.
🇬🇧 23 June - Royal Mail issued stamps to commemorate the 75th anniversary of the arrival of the Windrush, a ship carrying Caribbean immigrants to the United Kingdom. This iconic event marked the beginning of decades of mass immigration to Britain from around The Commonwealth and the rest of the world which was to change the nature and character of post-imperial Great Britain for ever.
🇮🇱🇲🇾🇮🇶🇯🇴 7 October - Terrorists belonging to Hamas, a group which was in control of the territory of Gaza, attacked its neighbour Israel and murdered more than 1100 people in a single day as well as carrying out other atrocities and kidnapping large numbers of people. In response, the Israeli government launched an operation aimed at destroying Hamas and launched missile attacks on, and invaded, Gaza. Several Muslim countries, including Malaysia, Iraq and Jordan, showed their support for Hamas by issuing stamps on the subject.
🇸🇭🇧🇸🇬🇧🇻🇬🇫🇰🇬🇸🇸🇭 21 October - Pobjoy Mint and Pobjoy Stamps, marketer and distributor of the postage stamps of seven Commonwealth postal administrations announced that it was to close by the end of 2023 on the retirement of its managing director, Taya Pobjoy. In the future, the various postal administrations were to handle their own distribution.
🇬🇾 24 December - The British government announced that it was sending HMS Trent to Guyana in a show of political and military support for the Commonwealth’s only South American country which was under threat of invasion by its neighbour, Venezuela, which had held a referendum on 3 December in which 96.37% of voters had agreed that Venezuala should create a new state of Guayana Essequiba and that that territory should be incorporated on “the map of Venezuelan territory”. At a meeting in St Vincent And The Grenadines on 15 December, the Presidents of Guyana and Venezuela, Irfaan Ali and Nicolás Maduro, had agreed not to use force to resolve the issue but on 28 December the Venezuelan government announced that it was going to hold “defensive” military exercises on its eastern Caribbean and Atlantic coasts involving 5600 soldiers.