Thieves stole 10 iPads after breaking into Grange Primary School in Dorothy Road, Kettering, in the early hours of Wednesday (May 25).
At around midnight, CCTV footage shows two men spending about 10 minutes looking through windows.
Shortly after at about 1.30am, the CCTV shows two men breaking into one of the classrooms and removing a cabinet containing the iPads.
The men wore black or grey hooded tops with the hoods up and jogging bottoms.
Witnesses or anyone with information about the stolen iPads is asked to call Northamptonshire Police on 101 or Crimestoppers anonymously on 0800 555111.