Pink paint has been daubed on the Queen Victoria plinth.
Guernsey Police are seeking witnesses to the defacing of a statue of Queen Victoria in Candie Gardens.
Pink paint has been daubed over the engraved Guernsey granite plinth that the bronze statue sits on.
Police believe it happened sometime between late afternoon on Wednesday 10 April to early morning on 11 April.
They say a window on a nearby outbuilding was also damaged.
The statue was put up in 1900 and is a replica of one that sits on the Thames Embankment.

Guernsey Prison Governor to 'step aside' during conduct investigation
Guernsey reservoir walk reopens following 'extensive' tree surgery
Two more Asian Hornets found in the Bailiwick of Guernsey
Guernsey Autism charity gets States commissioning deal
Digital travel permissions extended to Channel Islands this month
Major Guernsey Occupation film to be shot on-island this summer
62 new homes added to Guernsey's housing stock
Litter levels remain high on Guernsey beaches