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Diddy‘s facing a mountain of lawsuits from anonymous accusers, but now at least one of them has to reveal their name … or take an L in court.

According to new legal docs, obtained by TMZ, a judge in New York just ruled a woman suing Diddy for an alleged sexual assault she claims happened 20 years ago must reveal her identity or have her suit dismissed.

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The woman is suing as a Jane Doe … and her lawsuit is one of the 120 suits Texas attorney Tony Buzbee says he’s filing against Diddy.

In the ruling, Judge Mary Kay Vyskocil says … although the allegations are sensitive in nature, the Jane Doe has not shown she is entitled to remain anonymous … pointing out the woman is an adult who “decided to file a lawsuit in which she accuses a famous person of engaging in heinous conduct approximately 20 years ago.”

The judge says the woman must file a complaint in her own name by November 13 or the case will be thrown out of court.

As we first told you … this accuser was the first Buzbee client to file suit against Diddy, claiming he raped her under threat of violence in 2004 when she was a college freshman.

For his part, Diddy denied the allegations … saying he’s never sexually assaulted anyone.

We’ve reached out to Buzbee for comment … so far no word back.