Greenpeace Russia spokeswoman Maria Favorskaya said the final member of the group was told Thursday he could apply for an exit visa, RIA Novosti reported.
Earlier, Tass reported that 22 had already applied for visas and the Federal Migration Service said they will be issued as quickly as possible.
Twenty-eight activists and two journalists were arrested in September after two protesters attempted to scale the state-owned Gazprom oil rig.
The detainees, who are from 18 countries, were initially accused of piracy, but the charge was later reduced to hooliganism.
After two months in jail, the activists were freed on bail and later granted amnesty.