A petard was a medieval small bomb used to blow up gates and walls when breaching fortifications.
Petard may also refer to: HMS Petard, the name of two ships of the Royal Navy A firecracker
People with the surname Paul Petard (1912–1980), French botanist
See also "Petarded", an episode of Family Guy "Hoist with his own petard", a phrase from the Shakespeare play Hamlet H. Pétard, a pseudonym used by Ralph P. Boas Jr., based on the iconic phrase