A5

A5 can refer to:

• A5, an international standard paper size (148×210 mm) defined by ISO 216.
• A5, an aid climbing grade
• A5, an aid climbing gear manufacturer (founded by John Middendorf), which was absorbed by The North Face in 1997
• Bundesautobahn 5 or BAB 5, a German Autobahn
• A5 road (United Kingdom), connecting London to Holyhead (a second road in the UK shares this name)
• A5 (Switzerland), an expressway
• A5/1 and A5/2, ciphers used in cellular phones.
• HMS A5, an A-class submarine of the Royal Navy
• A5, a German rocket design in World War II
• A5 Juggernaut, an armored fighting vehicle in the Star Wars fictional universe
• A5 band (Apple 5), a Chinese band of 5 boys born in 1980s: Qu Xin, Sheng Chao, Zhang Ji, Gu Chengdong, Jin Lei
• In town and country planning in the UK, A5 is the code for permission to use specific land or premises for takeaways.

The variant A-5 can refer to:

• USS Pike (SS-6), a Plunger-class submarine of the United States Navy
• A-5 Vigilante, a carrier-based supersonic bomber designed for the US Navy
• Nanchang Q-5, a Chinese-built jet fighter bomber
• A-5 (paintball), A [paintball marker]] made by Tippmann