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.

Index of articles associated with the same name

This set index article includes a list of related items that share the same name (or similar names).
If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.