Ingrid Betancourt, now 54, spent six years in the jungle after being abducted by FARC while campaigning in Colombia's 2002 presidential election.
The charismatic Franco-Colombian former politician told France's iTele broadcaster she was "very, very happy" that the prize went to Santos, saying it showed "there was no turning back from peace".
Asked if she thought FARC should also have been honoured by the Nobel committee an emotional Betancourt said haltingly: "Yes... It's very hard for me to say yes... But I think so."
Betancourt said the Nobel Prize was a "just" reward for Santos.
"He was practically alone in fighting for this result. He is making history. He is giving the next generation the possibility of living in a different country. It's a huge moment for Colombia.
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