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'The Chi' star Sonja Sohn was arrested for cocaine possession ... TMZ has learned.

Sohn, who also starred in "The Wire," was arrested Sunday at 2 AM in North Carolina for cocaine possession, possession of marijuana and drug paraphernalia.

The paraphernalia charges are misdemeanors, but the cocaine charge is a felony.

Police tell us ... she was arrested and brought into the station at 2 AM and bailed out 6 minutes later.

She posted $1,500 bail and left the station.

She will be arraigned Tuesday.

Sonja played Detective Shakima Greggs on all 5 seasons of "The Wire." She plays Brandon's mom, Laverne, on "The Chi."