The 23-year-old McClain played three seasons with the Oakland Raiders before signing a one-year contract with Baltimore as a free agent on April 12.
"Rolando let me know that he plans to retire from the NFL," Ravens general manager Ozzie Newsome said Wednesday. "We have placed him on the Reserve/Retired list."
Ten days after signing with the Ravens, McClain was arrested in Decatur, Alabama, and charged with disorderly conduct and resisting arrest.
It was the third time McClain was arrested in Decatur since 2011. He was previously charged in a 2011 shooting, and police arrested him in January on charges of having his car windows tinted too darkly and trying to lie about his identity.
McClain was sentenced to jail on an assault charge after the shooting, but prosecutors later dismissed the case.
A city judge dismissed the January charge against McClain of trying to lie about his identity. He pleaded guilty to the window tint violation and paid a $182 fine.
Before joining the Ravens, McClain spent his first three NFL seasons with the Oakland Raiders. He was the eighth overall pick in the 2010 draft out of Alabama.
In 41 games with Oakland he had 274 tackles, 6½ sacks and one interception. In his final season, he was suspended for two games for conduct detrimental to the team.
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