In addition to the eight years jail, Justice David Collins ordered he serve a minimum non-parole period of five years.
One victim tearfully read out her impact statement to the court, and 11 more statements were read by officer in charge Senior Constable Tanya Ross.
Bell's offending started in 1999, when he indecently touched a four-year-old girl.
He was previously convicted in Napier, in January 2014, of three indecent assault charges, and sentenced to two years imprisonment.
"The trauma experienced by the victims as a result of this offending has been significant, and I know that reliving the trauma by giving evidence has been extremely difficult," Ms Ross said after sentencing. "I applaud them for their courage in coming forward, and I hope that today's sentence will contribute to their healing."
As Bell was taken from the courtroom, the father of one victim called out, telling him to "die in prison, you p***".
The details of the victim impact statements, as well as submissions from Crown prosecutor Harry Mallalieu and defence lawyer Fergus Steedman, were suppressed by Justice Collins.