Unknown people have vandalised the monument to Mro Lorenzo Gonzi, the prime minister's grandfather, in Kalkara.
Eyewitnesses said the stone and bronze monument was pushed off its pedestal.
The monument is in Holy Family Square, opposite Holy Family Band Club, of which he was founding bandmaster in 1914. It was erected in 1995.
The police are investigating.
The Holy Family Philharmonic Society and Kalkara council condemned the incident.