The honorific prefix "The Most Honourable" is a form of address that is used in several countries. In the United Kingdom, it precedes the name of a marquess or marchioness.
In Jamaica, Governors-General of Jamaica, as well as their spouses, are entitled to be styled "The Most Honourable" upon receipt of the Jamaican Order of the Nation. Prime Ministers of Jamaica, and their spouses, are also styled this way upon receipt of the Order of the Nation, which is only given to Jamaican Governors-General and Prime Ministers.
Certain dignitaries and recipients of honours in Africa are also so styled. For example, Knights and Dames invested in the dynastic orders of the Bunyoro-Kitara Kingdom of Uganda (Royal Order of the Engabu and the Royal Order of the Omujwaara Kondo) are granted the hereditary honorific style of "The Most Honourable".
In addition, the names of some groups use this prefix, such as "Her Majesty's Most Honourable Privy Council" in the United Kingdom.