Woman Accuses Mark Salling of Rape

Mark Salling allegedly raped a 22-year-old woman ... so claims the alleged victim, and now the L.A. County D.A. is deciding whether to file charges against him.

A woman claims she and Salling entered a room to have intercourse, but she changed her mind and told him no, saying, "I can't do this" -- this according to the police report. She told cops he refused to stop and forced himself on her.

The woman tells TMZ she and Salling had been dating a few months before the alleged incident.

The alleged victim filed a police report in April of this year ... nearly 4 years after the incident. She tells us she knew months earlier the former "Glee" star had been arrested for possessing child porn.

The D.A. is reviewing the case for possible rape charges.

We called Salling's rep for comment ... so far no word back.