David Cameron has led dozens of international tributes to Nelson Mandela, who has died in South Africa aged 95.
The Prime Minister said: "A great light has gone out in the world. Nelson Mandela was a towering figure in our time: a legend in life and now in death - a true global hero.
"I believe that his inspiration for the future will be every bit as powerful as the extraordinary things he achieved in his remarkable life."
MPs will be given the opportunity to pay their tributes to Mr Mandela in the House of Commons on Monday.
:: Live coverage: all the latest news and reaction now on Sky News HD
US President Barack Obama said he had achieved "more than can be expected by any man".
"Today he has gone home and we have lost one of the most inspirational, courageous and profoundly good human beings that any of us will share time with on this Earth," he said.
Bill Clinton was in office at the same time as Mr Mandela "He now no longer belongs to us, he belongs to the ages."
South African President Jacob Zuma made the emotional announcement live on television, in which he said Mr Mandela was now at peace.
He added: "Our nation has lost its greatest son."
FW de Klerk, South Africa's last white president, who shared the Nobel Peace Prize with Mr Mandela in 1993, said he was a "great unifier".
He added: "This emphasis on reconciliation was his greatest legacy."
South Africa's archbishop emeritus Desmond Tutu said South Africa was "drowned by grief".
Mr Mandela with FW de Klerk, with whom he shared a Nobel Peace Prize He said: "He was a unifier from the moment he walked out of prison."
French President Francois Hollande added: "Nelson Mandela's message will not disappear. It will continue to inspire fighters for freedom, and to give confidence to peoples in the defence of just causes and universal rights."
Australian Prime Minister Tony Abbott said: "He spent much of his life standing against the injustice of apartheid.
"When that fight was won, he inspired us again by his capacity to forgive and reconcile his country.
"While the world may never see another Nelson Mandela, he has inspired countless men and women throughout the world to live more courageous and honest lives."
Scotland's First Minister Alex Salmond described him as a "towering statesman" whose influence "transcended ideology, race and creed".
Desmond Tutu has said South Africa is 'drowned by grief' at his death Irish Taoiseach Enda Kenny said a "great light has been extinguished".
He said: "The boy from the Transkei has finished his long walk. His journey transformed not just South Africa, but humanity itself."
UN Secretary General Ban Ki Moon said: "Only because of such a great man like Nelson Mandela is it possible that particular people in Africa and elsewhere are able to enjoy freedom and human dignity.
"We have to learn the wisdom and determinations and commitment of Mr Mandela to make this world better for all."
Prince William and the Duchess of Cambridge also paid tribute at the Royal premiere of the new Nelson Mandela film, Long Walk To Freedom, in Leicester Square, London.
The Duke of Cambridge said: "It is extremely sad and tragic news. We are just reminded of what an extraordinary and inspiring man Nelson Mandela was."
Leading figures from around the world have also been joining in with praise for the anti-apartheid icon.
People listen to a radio as the news is announced in South Africa Former US president George W Bush said: "He bore his burdens with dignity and grace, and our world is better off because of his example."
Former prime minister Tony Blair described him as the world's "most powerful symbol of reconciliation, hope and progress".
Former US president Bill Clinton called Mr Mandela a "true friend".
He said: "History will remember Nelson Mandela as a champion for human dignity and freedom, for peace and reconciliation."
US Secretary of State John Kerry said: "Now that his long walk has ended, the example he set for all humanity lives on. He will be remembered as a pioneer for peace."
Labour Party leader Ed Miliband said: "Above all, he showed us the power of people, in the cause of justice, to overcome the mightiest obstacles. He moved the world and the world will miss him deeply."
Deputy Prime Minister Nick Clegg said: "The hope he offered was enough to unite races; it bridged cultures and transcended generations; and it could heal the deepest divides."

Foreign Secretary William Hague said: "An international icon and inspiration to millions, his appeal transcended race, religion and class. His courage, humility and sense of forgiveness have secured his place in history."
London Mayor Boris Johnson said: "When the definitive history of our time is written, the name Mandela will stand taller than most - perhaps tallest of them all."
A joint message from President of the European Commission, Jose Manuel Barroso, and President of the European Council, Herman Van Rompuy, said: "We mourn the death of one of the greatest political figures of our times.
"Nelson Mandela represents the fight against racism, political violence and intolerance. Only a person with his profound humanity, moral integrity and authority and clear vision for the future of his country, could have achieved this."
American civil rights leader Jesse Jackson said Mr Mandela has left an "everlasting imprint".
He said: "Nelson Mandela was a giant of immense and unwavering intellect, courage and moral authority. He chose reconciliation over retaliation. He challenged the course of history."
Israeli Prime Minister Benjamin Netanyahu said he was the "father of his people", adding: "He will be remembered as the father of new South Africa and as an outstanding moral leader."
German Chancellor Angela Merkel said: "Nelson Mandela's shining example and his political legacy of non-violence and the condemnation of all forms of racism will continue to inspire people around the world for many years to come.
Mexican President Enrique Pena Nieto said: "Humanity has lost a tireless champion of peace, liberty and equality."
Nelson Mandela with Oliver Tambo
Mr Mandela in 1961
Mr Mandela with his second wife Winnie
Mandela spent 18 years in Robben Island Prison
Mr Mandela casts his first-ever vote
Mr Mandela at the closing ceremony of the 2010 World Cup
Greig and co-host Christian, who has returned to the airwaves
Greig and Christian apologised after Ms Saldanha died
Residents will mark the anniversary of the shootings this month
Newtown shooter Adam Lanza
Boxer Vitali Klitschko walks past police outside parliament
Protesters have been involved in clashes with police
A bus that was set on fire during the protests
Demonstrators flee from riot police
Protesters near the police HQ in Bangkok are sprayed with water
Mr Cameron visited a Jaguar Land Rover plant in China
Neither Mr Cameron nor Mr Li mentioned Tibet directly in public statements
It is the largest ever British mission of its kind to China
Mr Cameron and Nick Clegg met the Dalai Lama last year
The rally is the biggest seen in the Ukraine since the Orange Revolution
People are angry after the president back-tracked on a deal with the EU
Heavyweight boxing champion Vitaly Klitschko is a leading critic
Some protesters tried to use a digger to break through police lines
There are "multiple injuries" at the scene. Pic: Naomi Fink
Emergency workers examine one of the carriages
The crash occurred close to the Hudson and Harlem rivers
The Dome of the Rock is part of the al Aqsa complex under Muslim control
The Grand Mufti says if Israelis push the issue the region will be at war
In 2000, 4,000 people died in the Second or 'al Aqsa' Intifada
Religious tensions are high
A Red Shirt is attacked by anti-government protesters
Yingluck Shinawatra is accused of being a puppet for her brother
Protesters tear down barricades outside Government House