The unpaid position involves fostering bilateral relations in the fields of "culture, art, public and youth exchanges", according to Moscow.
Russian Foreign Ministry which made the announcement on Facebook late on Saturday said Seagal will be tasked with furthering "Russian-American relations".
Relations between Russian Federation and the USA have soured over allegations that Moscow interfered in the 2016 U.S. presidential race, which Russian Federation repeatedly denies.
But Seagal, star of Under Siege, Above the Law and Hard to Kill has faced criticism for his bromance with the Russian leader.
In March of this year, two women who previously accused Steven Seagal of rape and sexual assault stepped forward to offer more detailed accounts of the actor's alleged misconduct.
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The actor, who was granted Russian citizenship in 2016, has robustly defended the Russian leader's policies and once told Piers Morgan on ITV's Good Morning Britain that anyone who thought Putin had attempted to rig the United States elections was "stupid".
"The very case when folk diplomacy meets diplomacy traditional".
Seagal sometimes appears on Russian state TV to talk about his views and career, was cited by Kremlin-backed TV station RT as welcoming the appointment.
The 66-year-old has called President Putin "one of the great living world leaders", and when Seagal was granted Russian citizenship, said he hoped it would be a symbol of how relations between Moscow and Washington were starting to improve. "I have worked tirelessly in this direction for many years unofficially and I am now very grateful for the opportunity to do the same thing officially".
Seagal's grandmother was born in Vladivostok, and the actor and Putin share a passion for martial arts.