The roller rink marquee in Onchan Park was damaged in the early hours of today (Good Friday).
One of the large marques had several PVC window panels slashed on two sides.
The roller rink is still open as usual.
Constable Katrina Keeling said the incident happened between 2.30am and 3:10am.
She said: ‘The police are keen to hear from anybody who may have been involved in, or witnessed anything at the time.’