The Nobel committee in Norway praised him for his peace agreement with Farc rebels, signed last month after four years of negotiations, the BBC reported.
However, Colombians narrowly rejected the deal in a referendum last weekend.
The conflict has killed about 260,000 people have been killed. More than six million have been internally displaced.
BREAKING NEWS The 2016 #NobelPrize#Peace is awarded to Colombian President Juan Manuel Santos pic.twitter.com/7OhiCruc1o
— The Nobel Prize (@NobelPrize) 7 октября 2016 г.
"The Norwegian Nobel Committee has decided to award the Nobel Peace Prize for 2016 to Colombian President Juan Manuel Santos for his resolute efforts to bring the country's more than 50-year-long civil war to an end," said committee chairwoman Kaci Kullmann Five.
#NobelFacts Now there are 2 Nobel Laureates born in Colombia – Juan Manuel Santos and Gabriel García Márquez (#NobelPrize Literature 1982)
— The Nobel Prize (@NobelPrize) 7 октября 2016 г.
Mr. Santos has vowed to continue with negotiations with the rebels. Critics had said the concessions to the group had gone too far.
