4.5 inch (114 mm) gun

4.5 inch gun may refer to:

• QF 4.5-inch howitzer, a British Army weapon of the World War I era
• QF 4.5-inch Mk I – V naval gun, a British family of naval guns, actually of 4.45 inches (113 mm) calibre, in service 1938 through 2013
• 4.5-inch Mark 8 naval gun, a British naval gun in service 1972 through at least 2018
• BL 4.5-inch Medium Field Gun, a British Army field gun of the World War II era
• 4.5-inch Gun M1, a United States field gun of World War II era.

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