One of the victims was a childhood friend of his daughter, while another was aged seven or eight.
The court heard Harris, 84, was a "Jekyll and Hyde" character, and he will be sentenced on Friday.
Police also said they were considering fresh allegations against Harris which did not form part of his recent trial.
Justice Sweeney said a custodial term was "uppermost in the court's mind", but he wanted to see a medical report before sentencing.
Harris, who was granted bail, faced a mass of photographers and reporters as he left Southwark Crown Court in the company of his wife Alwen and daughter Bindi.
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The central allegation concerned a friend of Harris's daughter, whom the court heard he groomed and molested from the age of 13 until she was 19.
The other victims told the court they were touched or groped by Harris, sometimes at his public appearances.
The jury deliberated for 37 hours and 45 minutes before reaching their unanimous verdicts.
The assaults took place between 1968 and 1986 and involved girls and women ranging in age from 7 to 19, a spokesman for the Crown Prosecution Service said.