Condolences have poured in from monarchs and heads of former Royal Families following the passing of Prince Philip on Friday, 9 April 2021.

The Royal Family have set up an online condolence book for anyone wishing to pay their respects to Prince Philip on their official website.
A further statement from Buckingham Palace has said the Royal Family has requested that the public do not gather at Royal Residences, especially in large groups, and to express their condolences does so in the safest way possible, according to current government coronavirus guidelines.
However, members of the public who wish to pay tribute to the Duke of Edinburgh are encouraged to donate to a charity of their choice.
Or an organisation or charity which Prince Philip supported as patron or president as part of his official duties, rather than leave flowers at any of the Royal Residences.
Prince Philip was The Duke of Edinburgh was the patron or president of over 990 organisations, focusing on special interests in scientific and technological research and development, industry, the welfare of young people, conservation and the environment and the encouragement of sport including the Duke of Edinburgh Award scheme.

Belgium
King Philippe and Queen Mathilde’s have also paid tribute via social media in English, French and Dutch.

Deeply saddened by the passing away of His Royal Highness The Prince Philip, Duke of Edinburgh. We wish to express our deepest condolences to Her Majesty The Queen, the British Royal Family and the people of the United Kingdom. We will always cherish the memories of our warm encounters.
Philippe and Mathilde
Bhutan
King Jigme Khesar Namgyel Wangchuck of Bhutan posted his condolences on Facebook.
His Majesty The King and Her Majesty The Gyaltsuen are deeply saddened by the passing of His Royal Highness The Prince Philip, Duke of Edinburgh. Their Majesties have conveyed condolences from the people of Bhutan to Her Majesty Queen Elizabeth II. Upon Royal Command, special prayers are being held across the country in memory of His Royal Highness. Their Majesties will offer prayers and light 1,000 butterlamps at Mongar Dzong, and the government, joined by UK residents in Bhutan, will offer prayers and 1,000 butterlamps at the Simtokha Dzong tomorrow. Bhutan and the United Kingdom share exceptionally warm relations, going back to the time of His Majesty King Ugyen Wangchuck, the first King of Bhutan. The people of Bhutan join the people of the United Kingdom in mourning the passing of His Royal Highness, whose lifetime of steadfast service to his country shall serve as an inspiration for us all.
Denmark
Her Majesty The Queen has today sent personal condolences to Her Majesty Queen Elizabeth II in connection with the death of His Royal Highness Prince Philip, The Duke of Edinburgh.
Prince Philip was born in 1921 as Prince of Greece and Denmark and was a grandchild of Christian the 9th.

The Royal Court of Denmark’s Facebook post included a photo of Prince Philip wearing the Danish Order of the Elephant in a 2017 portrait by Australian-born artist Ralph Heimans.
Luxembourg
Grand Duke Henri of Luxembourg has also sent a message.

Monaco
Prince Albert II sends a message on behalf of Monaco.

Netherlands
King Willem-Alexander, Queen Máxima and Princess Beatrice have also expressed their condolences.
It is with great respect that we remember His Royal Highness Prince Philip. Throughout his long life, he committed himself with dedication to the British people and to his many duties and responsibilities. His lively personality never ceased to leave an unforgettable impression. Our deepest and most heartfelt sympathy goes out to Her Majesty Queen Elizabeth and all the members of the Royal Family.
Norway
King Harald of Norway has said, ‘Our thoughts are with Queen Elizabeth and the rest of her family. We also send our condolences to the British people.’
A statement from the Royal Court of Norway said the King has decided that the flag on the palace balcony ‘will be flown at half-mast today’ and on the day of the funeral.
Serbia
A statement from the Royal Palace in Belgrade has also paid tribute with photos of Crown Prince Alexander and Prince Philip pictured together on 24 January 2013.
Prince Philip attended the funeral of his niece Princess Margarita of Baden at the Serbian Orthodox Church of Saint Sava on 24 January 2013 in London.

TRH Crown Prince Alexander and Crown Princess Katherine and the entire Royal Family received with great sadness the news that HRH Prince Philip, Duke of Edinburgh, the husband of Her Majesty Queen Elizabeth II of Great Britain, godmother of the Crown Prince, passed away today.
The whole life of Prince Philip was dedicated to the service of the British Crown and the people. He is survived by his wife, Her Majesty Queen Elizabeth II, four children, eight grandchildren and ten great-grandchildren.
Prince Philip was the son of the Greek and Danish Prince Andrew, the brother of the Greek King Constantine, the maternal great-grandfather of Crown Prince Alexander.
Crown Prince Alexander and the Royal Family had a good cousin and a sincere friend in the late Duke, whose memory will live forever. His departure will create a great void in the hearts of all who knew him.

Sweden
King Carl Gustaf has also issued a statement regarding Prince Philip’s passing, accompanied by a photo of Queen Elizabeth II and Prince Philip during an official visit to Sweden in 1983.
The Queen and I were deeply saddened to learn of the death of His Royal Highness The Duke of Edinburgh.
Prince Philip has been a great friend of our family for many years, a relation which we have deeply valued.
His service to his country will remain an inspiration to us all.
We offer our sinceree condolences to Her Majesty The Queen, The Royal Family and the people of the United Kingdom.
CARL GUSTAF
And a Vice-Regal one …
The Governor-General of Australia David Hurley has posted on Facebook, saying he ‘is deeply saddened to advise Australians that His Royal Highness Prince Philip, Duke of Edinburgh, has passed away.’
It is my solemn and melancholy duty to advise that His Royal Highness Prince Philip, Duke of Edinburgh, has passed away earlier today.
I have informed the Prime Minister, and I understand the Government will make further announcements concerning funeral arrangements and how Australians can express their condolences, in due course.
This is a sad and historic day.
As we mourn, we should also reflect and give thanks for His Royal Highness’ lifetime of service, devotion and commitment.
Service beginning with his time in the Royal Navy – including during the Second World War when he was mentioned in dispatches while a young sub-Lieutenant on-board HMS VALIANT.
Devotion to Her Majesty The Queen, whom he married in 1947 and lovingly supported throughout his life, and to the entire Royal Family.
And commitment to the Commonwealth and the many hundreds of organisations – including many here in Australia – of which he served as Patron and for whom he was a passionate advocate and supporter.
His Royal Highness visited Australia 21 times over the years, including on each of Her Majesty’s State Visits.
He was a popular, engaged and welcome visitor to our shores.
His impact was profound – not least on the more than 775,000 young Australians who have participated in The Duke of Edinburgh’s International Award since it began here in 1959.
Many Australians will have a personal memory of His Royal Highness and many around the world will, in coming days, reflect on his remarkable life and legacy.
As we reflect and remember, we think especially of Her Majesty The Queen and the Royal Family, who have lost a beloved husband, father, grandfather and great-grandfather.
On behalf of the Australian people, I extend our deepest condolences to Her Majesty and family, the people of the Commonwealth and to all those who share in this sad news.
We give thanks for the Duke of Edinburgh’s service, his loyal and loving devotion to Her Majesty and his commitment to Australia, The Commonwealth and all her people.
May he Rest in Peace.