The Scotland U21 international joins the Sky Bet League 1 side for the first part of the 2017/18 season.
Ruddy learned his trade at Rangers before making a move to Spain to sign his first professional deal with Real Murcia. He moved back to the UK in July 2014 to join Bury before eventually arriving at Wolves in August last year.
All at Wolves would like to wish Jack the best of luck for his time at Boundary Park as the 'keeper looksto gain invaluable league experience.