Actress Tiffany Haddish revealed details about the bizarre incident in an interview with GQ, but left the culprit unnamed.
Two actresses have already had to deny being guilty following media speculation.
Now fans are using #WhoBitBeyonce to track down the person responsible.
Tiffany, who stars in Girls Trip, said she met Beyonce at a party in December last year.
"There was this actress there that's just, like, doing the mostest," she told GQ.
"She bit Beyonce in the face... So Beyonce stormed away, went up to Jay Z, and was like, 'Jay! Come here!' - and snatched him.
"They went to the back of the room. I was like, 'What just happened?'"
Beyonce's representatives told GQ they don't know anything about the incident with the actress, who Tiffany has not named.
But that hasn't stopped the Beyhive from speculating wildly.