The 27-year-old Frenchman's semen tested positive for Zika in March this year, three months after he experienced symptoms of an infection picked up while travelling in Thailand last October and November.
The case was reported in The Lancet medical journal this week.
The previous longest recorded virus survival in semen was 62 days after the onset of symptoms.
Benign in most people, Zika has been linked to microcephaly -- a shrinking of the brain and skull -- in babies, and to rare, potentially-fatal adult-onset neurological problems.
In an outbreak that started last year, about 1.5 million people have been infected with Zika in Brazil, and more than 1,600 babies born with microcephaly, according to the World Health Organization.
The new case highlights that people returning from areas where Zika is non-endemic, such as Thailand, can also be infected, said the report authored by health specialists from Toulouse in southern France.
The possibility of "protracted" virus presence should be kept in mind when people plan to have children, it added.
