Prominent human rights lawyer Abdolfattah Soltani was released from prison after eight years in prison in Iran, reported the semi-official ISNA news agency on Wednesday.
Soltani co-founded a human rights group with Iranian Nobel Peace Prize laureate Shirin Ebadi.
He was sentenced to 10 years' imprisonment in 2011 on charges of anti-government activities during the rule of hardline President Mahmoud Ahmadinejad.
He was reunited with his family after a Revolutionary Court ruled to release him on Tuesday, said ISNA.
Under Iranian law, convicts can be granted conditional freedom after serving at least half of their prison terms.
Soltani was briefly released from prison to attend the funeral of his 30-year-old daughter Homa who died in August of a heart attack.
Iran has jailed scores of lawyers and activists on similar charges.
