The Mark 30 torpedo was a British 18-inch air dropped anti-submarine passive acoustic homing torpedo.

The torpedo was air dropped from the Hawker-Siddeley Nimrod and Avro Shackleton aircraft.

The Mark 30, also referred to by its project name as Dealer B, was an eight-fin passive homing torpedo using conventional propellers.

Issued in June 1954, Mark 30 production saw approximately 1,200 being built.

Development on a variant, the Mark 30 Mod 1, was cancelled in 1955[2] after the Royal Navy decided to purchase the American Mark 43 torpedo as a replacement.