Bilawal, in his 20s, was addressing the party workers in Multan region in Punjab on Friday.
"I will take back Kashmir, all of it, and I will not leave behind a single inch of it because, like the other provinces, it belongs to Pakistan," said the scion of highly influential Bhutto family.
When Bilawal made these remarks, he was flanked by former prime ministers Yousaf Raza Gilani and Raja Pervaiz Asharaf.
Bilawal, who has announced plans to contest next general elections in 2018, heads the secular Pakistan People's Party which officially wants good ties with India.
His mother, former slain premier Benazir Bhutto, was twice elected as prime minister while his maternal grandfather Zulfiqar Ali Bhutto, who founded the PPP in 1967, also served as prime minister in 1970s.
Bilawal's father Asif Ali Zardari was Pakistan's president from 2008 to 2013.

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