A 13-year-old girl was viciously attacked by a stranger who choked the frightened teen inside a Brooklyn subway car , cops said Tuesday.

The youngster was aboard a Brooklyn-bound G train on Nov 17 around 7:50 a.m. near Keap St. and Union Ave. in Williamsburg when a man approached her and grabbed her throat — applying so much pressure the frightened teen had trouble breathing, cops said.

The unhinged passenger took off when the train came to a stop.

EMS treated the teen for injuries to the neck.

The suspect was described as dressed in a black sweatshirt, pink jacket, black pants, and black sneakers.

Anyone with information is asked to call the NYPD’s Crime Stoppers Hotline at 1-800-577-TIPS (8477)

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