0355 GMT April 23, 2019
Mousavi formerly worked as the director general of Department of Information and Press Affairs of the Foreign Ministry, according to IRNA.
He replaced Bahram Qassemi and will be the 11th spokesman since 1979.
Qassemi, who was the Foreign Ministry spokesman for two years, was appointed as Iran's ambassador to France in March. He will be Iran's first ambassador to France after six months of diplomatic tension between the two countries over Iran's missile programs, in the aftermaths of the US pullout from the nuclear agreement with Iran in May 2018.
Qassemi is a career diplomat, who has served in Ireland, Italy, Spain and Malta.