The band's publicist, Heather Lylis, says Travers died at Danbury Hospital in Connecticut on Wednesday. She was 72 and had battled leukemia for several years.
Travers joined forces with Peter Yarrow and Noel Paul Stookey in the early 1960s.
The trio mingled their music with liberal politics, both onstage and off. Their version of 'If I Had a Hammer' became an anthem for racial equality. Other hits included 'Lemon Tree,' 'Leaving on a Jet Plane' and 'Puff (The Magic Dragon.)'
They were early champions of Bob Dylan and performed his 'Blowin' in the Wind' at the August 1963 March on Washington."