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His new bride is Margaret "Parky" DeVogelaere, and the couple tied the knot in Hawaii, according to Fonda's rep.
This is his third marriage. His first, in 1961 to Susan Brewer, produced two children, actress Bridget Fonda and Justin Fonda, and ended in divorce in 1972. A second marriage, in 1975 to Portia Crockett, ended in divorce earlier this year.
As a member of a Hollywood dynasty, Fonda, 71, is the son of screen legend Henry Fonda (1905-1982) and the younger brother of Jane Fonda, 73.
He was most recently seen as William Hunt in CSI:NY and as himself in the BP Deepwater Horizon oil spill documentary The Big Fix, which premiered at last month's Cannes Film Festival, adds his rep.