The revelation of a “historic” complaint against Tim Westwood means the former Radio 1 DJ now faces six allegations of bullying or sexual misconduct.
Former Pimp My Ride UK host Westwood, 64, stepped down from his show on Capital Xtra in April after accusations of unwanted sexual behaviour and touching. He denies the allegations.
In April, BBC director general Tim Davie said "no evidence of complaints" had been found to have been made against Westwood while he was at the corporation.
The alleged offences took place between 1992 and 2017.
But on Monday, the BBC said a complaint had previously been referred to the police.
In relation to the police referral, a BBC spokesman said in a statement: “This is a historic case that the BBC has found in its files. We are establishing the facts around it.
“It did not relate to conduct at the BBC, BBC premises, or conduct towards a BBC staff member, nor was it an accusation of physical assault.”
A joint BBC and Guardian investigation published the allegations against Westwood - a leading white voice in the UK hip hop scene for three decades.
The documentary Tim Westwood: Abuse of Power aired on BBC 3 and is still available on iPlayer.
A further statement from the BBC added: “As we have said, if people have things that they want to raise with the BBC, then they should do so. People have now done so and we will continue to investigate.
“We also said that we would dig into what happened in the past. We are doing that with great care. All of that work hasn’t concluded and is ongoing. We said we would take this seriously, and we are. When that work has concluded, we will say more.”
The Standard has approached Mr Westwood’s representation for comment.
Previously, a spokesperson for Tim Westwood said: “Tim Westwood strongly denies all allegations of inappropriate behaviour.
“In a career that has spanned 40 years, there have never been any complaints made against him officially or unofficially.”