Magnum may mean:

• .357 Magnum
• .44 Magnum
• Magnum (band)
• Magnum (condom), a condom brand manufactured by Trojan
• Magnum (ice cream)
• Magnum (pose)
• Magnum (rocket)
• Magnum 44, a heavy-duty permanent marker manufactured by Sanford
• Magnum Concilium, a council of British nobles
• Magnum Force, a 1973 film starring Clint Eastwood
• Magnum opus, an artist or author's best or most renowned work
• Magnum Opus, an album
• Magnum Photos
• Magnum, P.I., a 1980s TV series starring Tom Selleck
• Magnum, P.I. (film), a 2007 film based on the 1980s TV series
• Magnum Electronics, Inc. A Motorola Radio Dealer based in Dover, DE.
• Magnum Research
• Magnum is called out on the radio when a air force pilot launches a AGM-88 missile

• .475 Wildey Magnum
• Colt Python .357 Magnum, a handgun
• Dodge Magnum, a car
• Foramen magnum, the hole in the human skull
• Magnum Innominandum, one of the Cthulhu mythos supernatural characters
• MIPS Magnum, a type of computer workstation
• Vauxhall Magnum, a car
• Yak-30 Magnum
• A Chrysler LA engine line of which several are named Magnum
• A wine bottle of Champagne that holds 1.5 litres
• A former member of the rock band Lordi who used the name Magnum

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