Andrew Mountbatten-Windsor has handed back the Grand Cross of the Order of St. Olav to Norway's Royal House.
The Norwegian Palace confirmed he is no longer recorded as holding the prestigious honour.
"Andrew Mountbatten-Windsor has chosen to return his order," a Palace spokesperson in Oslo stated.
The decision comes on the same day the late Queen Elizabeth II's second son was taken into custody on suspicion of misconduct in public office.
Andrew Mountbatten-Windsor has handed back the Grand Cross of the Order of St. Olav to Norway's Royal House.
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Norwegian royal officials declined to explain the reasons behind the return, citing confidentiality protocols surrounding such awards.
King Olav bestowed the distinction upon Mr Mountbatten-Windsor in 1988, during a period when the British and Norwegian royal households enjoyed particularly warm relations.
The Order of St. Olav stands as Norway's highest civilian honour, awarded to individuals who have demonstrated exceptional service.
King Olav V, who occupied the Norwegian throne until 1991, met with Queen Elizabeth II on multiple occasions throughout their respective reigns.
King Olav bestowed the distinction upon Mr Mountbatten-Windsor in 1988
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The Norwegian monarch had strong personal ties to Britain, having resided in England during the Second World War and being a cousin to the British Royal Family, which led to frequent visits to the United Kingdom.
Last year, King Charles removed his younger brother's princely title and required him to vacate his residence at Windsor, as the monarch sought to create distance between Mr Mountbatten-Windsor and the wider Royal Family.
These measures followed mounting pressure over Mr Mountbatten-Windsor's association with the Epstein scandal, which has continued to cast a shadow over the institution.
Thursday's arrest on suspicion of misconduct in public office represents the latest development in the ongoing controversy.
King Harald of Norway is 88 years old
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Andrew Mountbatten-Windsor has been arrested on suspicion of misconduct in public office
| GETTYMr Mountbatten-Windsor has consistently and strenuously denied any wrongdoing amid the ongoing allegations.
The British and Norwegian Royal Families share deep historical connections that span generations.
King Harald, Norway's current sovereign, is related to both King Charles and Mr Mountbatten-Windsor through multiple royal lineages, including descent from Queen Victoria, who ruled Britain during the 19th century.