Dum Dum (Bengali দমদম Dômdôm) is a populated municipality now corporation under Barrakpore Commissionaire April 2015 by Smt Mamata Banerjee Chief Minister West Bengal near north Kolkata. It comes under Barrackpore sub-division and North 24 Parganas district of the state of West Bengal. It is a part of the area covered by Kolkata Metropolitan Development Authority. It is one of the main entry points to the city of Kolkata, providing a number of transportation facilities into that city from the northwest, such as Netaji Subhas Chandra Bose International Airport, formerly Dum Dum Airport, which offers domestic and international flights. Dum Dum has developed into a modern commercial centre and also hosts the Ordnance Factory Dumdum (OFDC) and Gun & Shell Factory Cossipore(GSF) of the Ordnance Factories Board, which manufactures armaments and other equipment for the Indian Armed Forces, Navy & Air Force. Dum Dum region is about 10  km from the city centre, defined as the Esplanade, Kolkata. The nearby localities include Nager Bazar, Motijheel, Ghughu Danga, Private Road, Chatakal, Jawpur, Rajbari and Lal Bagan.

Dum Dum is a city in West Bengal, India.

Expanding bullets are projectiles designed to expand on impact, increasing in diameter to limit penetration and/or produce a larger diameter wound for faster incapacitation. Therefore, they are used for hunting and by some police departments, but are generally prohibited for use in war. Two typical designs are the hollow-point bullet and the soft-point bullet.