I5, I-5 or I 5 may refer to:

Look up I-5 in Wiktionary, the free dictionary.

• Intel Core i5, a brand of microprocessors
• i5, an IBM AS/400 line of minicomputers
  • i5/OS, previous name of the IBM i operating system

• Japanese submarine I-5, a 1931 Junsen type submarine
• Polikarpov I-5, a Soviet fighter biplane of the 1930s
• I 5, a Swedish regimental designation (5th Infantry Regiment) that has been used by the following units:
  • 2nd Life Grenadier Regiment (1816–1927)
  • Jämtland Ranger Regiment (1928–1974, 1990–1994, 2000–2004)

• Interstate 5 (I-5), a US highway
• Inline-five engine, or straight-five engine
• AirAsia India (IATA code)
• General Electric I-5, the "industrial" model of GE's Elec-Trak electric tractor
• The electric version of the BMW 5 series, BMW I5

• I5 (girl group), American band in 2000-2001
• Inferior Five, fictional superhero group from DC Comics

• iPhone 5, an Apple smartphone

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