The England international has previously pleaded guilty to grooming a child and one count of s3xual activity with a child and will be sentenced in two to three weeks.
Adam Johnson has been found guilty of one count of s3xual activity with a child having earlier been found not guilty of a similar charge.
The former Sunderland player has been on trial at Bradford Crown Court after being arrested originally on 2 March 2015 following allegations of a relationship with a 15-year-old Sunderland supporter.
After two weeks of evidence and over nine hours of deliberations, the jury decided that the England international was guilty of a charge relating to s3xual touching having come to a majority verdict.
Johnson was found not guilty of a second count, however, which related to a s3xual act being performed on him.
Previously, on the first day of the trial, Johnson pleaded guilty to grooming and one count of s3xual activity with a child.
This led to Sunderland terminating the player's contract with the club having previously stood by him when the arrest was first made.
In a short statement the club said: ""In light of Adam Johnson's guilty pleas, the club has today terminated his contract with immediate effect."
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