John Pycock, 83, who was a Scout leader in Billinghay and then later in Fiskerton, had denied five sexual offences against one victim, who is now an adult and can not be named.
But a jury at Lincoln Crown Court found Pycock guilty of one count of indecency with a child, two charges of indecent assault on a male and two other serious sexual offences.
Pycock, formerly of Fiskerton and Winn Steeet, Lincoln, hung his head but showed little reaction as the jury returned their guilty verdicts.
Prosecution barrister Michael Cranmer-Brown asked for sentence on Pycock to be adjourned for an impact statement to be taken from the victim.
He now faces a third prison sentence after previously being jailed in 2014 and 2020 for sex offences.
Jurors heard the current offences occurred in the late 1980’s and early 1990’s when Pycock was a Scout leader in Lincolnshire.
Pycock will be sentenced on Friday (March 22).
If you have suffered abuse or would like to discuss experiences, please contact out specialist child abuse solicitor, Charles Derham on the following: