Michael Taylor, 65, was found guilty of seven offences – including three counts of unlawful intercourse with a girl aged under 13 – following a trial.
The defendant, formerly of Beech Drive, Chesterfield, was also convicted of four counts of Indecent assault on a girl under the age of 14.
He was jailed at Derby Crown Court on Friday (May 10) for 20 years and six months.