G5, G.V, G.5 or G-5 is a two character combination which may refer to any of many items, classifications, and entities:
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- five of the world's leading economies in mid-1970s — France, Germany, Japan, the United Kingdom, and the United States
- the leading five emerging economies in mid-2000s — Brazil, People's Republic of China, India, Mexico, and South Africa
- G5 group, former group of the largest West European countries: France, Germany, Italy, the United Kingdom, and Spain, now expanded to G6 (EU) by Poland's join.
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- G5 is
- G5 howitzer, a South African howitzer
- Canon PowerShot G5, a digital camera
- Leitner system, learning box in Iran
- Fiat G.5, a Fiat aircraft
- Gulfstream G500, private jet aircraft (GulfStream V family)
- LNER Class G5, the post-1923 designation for NER Class O steam locomotives
- PRR G5, a 4-6-0 steam locomotive built for the Pennsylvania Railroad
- Logitech G5, a gaming mouse with variable weight and sensitivity settings
- Mazda G engine#G5, a Mazda piston engine
- Motorola G5 project, the failed Motorola PowerPC project to succeed its own PPC 74x
- Ping G5, a golf club produced by Ping
- Pontiac G5, an automobile
- PowerPC G5, a microprocessor branding used by Apple Inc
- Power Mac G5, Apple's marketing name for models of the Power Macintosh which contain the IBM PowerPC G5 CPU
- iMac G5, a series of desktop Macintosh computers designed and built by Apple Inc. using the PowerPC chip architecture
- G.V, a German designation for several World War I heavy bombers:
- AEG G.V, a biplane bomber aircraft of World War I, a further refinement of the AEG G.IV
- Gotha G.V, a heavy bomber used by the Luftstreitkräfte (Imperial German Air Service) during World War I
- G-5 class motor torpedo boat, a World War II Soviet torpedo boat
- Empirix Hammer G5, a functional and load testing VoIP call generator by Empirix Inc
- G5, a model from the George Foreman Grill series
- The former haplogroup G5 (Y-DNA), a human Y chromosome haplogroup, now known as haplogroup G2c