J5, J 5, J05 or J-5 may refer to:
- Fender J5 Telecaster, a guitar model made by Fender
- ATC code J05 Antivirals for systemic use, a subgroup of the Anatomical Therapeutic Chemical Classification System
- County Route J5 (California), a County route in San Joaquin County, California
- GSR Class J5, a 1921 Irish 0-6-0 steam locomotives class
- HMS J5, a 1916 Royal Australian Navy J class submarine
- Joint Chiefs of Global Tax Enforcement (J5), a global joint operational group, formed in mid-2018 to combat transnational tax crime
- Junkers J 5, a German Junkers aircraft
- Mazda J5 Engine, a Mazda piston engine
- LNER Class J5, a class of British steam locomotives
- Peugeot J5, a midsize van manufactured from 1981 to 1993, a rebadged Fiat Ducato
- Piper J-5 'Cub Cruiser', a three-seat aircraft build during the 1940s.
- Shenyang J-5, Chinese version of the MiG-17
- Eirene (moon), previously known as S/2003 J 5, a retrograde irregular satellite of Jupiter
- Samsung Galaxy J5, a smartphone produced by Samsung
- TVB J5, a Television Broadcasts Limited's TV Channel (Feb 2016-Aug 2017), formerly called TVB HD Jade(高清翡翠台), after name changed to TVB Finance & Information Channel(無綫財經·資訊台)
- Pentagonal cupola, Johnson Solid number 5
and also:
- The Jackson 5, a Motown R&B/soul act
- Johnny 5, the robotic star of the movies Short Circuit and Short Circuit 2
- Jump5, a dance pop group
- Jurassic 5, a hip hop group
- Ranger (yacht), an America's Cup racing yacht built 1937
- The character J-5 played by Lou Wagner in Lost in Space
- J05: Acute obstructive laryngitis (croup) and epiglottitis ICD-10 code