Grantorto is a comune (municipality) in the Province of Padua in the Italian region Veneto, located about northwest of Venice and about northwest of Padua. As of 31 December 2004, it had a population of 4,072 and an area of .
Grantorto borders the following municipalities: Carmignano di Brenta, Fontaniva, Gazzo, Piazzola sul Brenta, San Giorgio in Bosco, San Pietro in Gu.
Grantorto is twinned with: