US President Joe Biden said: "Prince Philip gladly dedicated himself to the people of the UK, the Commonwealth, and to his family.
“The impact of his decades of devoted public service is evident in the worthy causes he lifted up as patron, in the environmental efforts he championed, in the members of the armed forces that he supported, in the young people he inspired, and so much more.”
The New York Post's coverage said Philip was known for his "easy-going humour, dapper wardrobe and sometimes startling frankness".
It added: "Despite never being crowned king, the Duke played an important role behind closed doors, supporting his wife of seven decades during times of great tumult."
Elsewhere around the world, King Carl XVI Gustaf of Sweden praised Philip as "a good friend of our family with a friendship we have placed great value on."
The Belgian Royal Palace said it was deeply saddened by the death of the Duke of Edinburgh, tweeting a tribute along with photos of the family with Prince Philip.
The palace said: “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.
“Philippe and Mathilde.”
Russian Leader Vladimir Putin also issued his condolences to Queen Elizabeth over the death of Prince Philip, the Kremlin press service has announced.
Mr Putin was said to write: ‘Philip was tied to many important events in the recent history of your country. He was rightly respected among the British public and bore international authority.’
He also wished that Queen Elizabeth be “courage and mental fortitude in the face of a heavy and irreparable loss,” and asked his condolences to be passed on to all members of the Royal Family.