The youngster's death marked the first fatality in a string of demonstrations across the Himalayan territory that have been staged against the Israeli military campaign.
The boy, a ninth-class student, was killed in the village of Khudwani, 60km south of Srinagar, the main city of the disputed Muslim-majority region of Kashmir.
"The boy died in (police) firing on anti-Israel protesters who were also angry about injuries suffered by other protesters during earlier demonstrations," a senior police officer told AFP.