5W or 5-W may refer to:

Look up 5w in Wiktionary, the free dictionary.

• 5°W, or 5th meridian west, a line of longitude
• 5 watts
• 5 weeks
• 5 wins, abbreviated in a win–loss record (pitching)

• 5W, IATA code of Wizz Air Abu Dhabi
• 5w, a viscosity grade of motor oil
• I-5W, westbound Interstate 5
  • Interstate 5 in California
• AD-5W, a version of the Douglas A-1 Skyraider
• 5W, then IATA code for Astraeus Airlines which operated from 2002 until 2011

• Five Ws: Who?, What?, When?, Where?, and Why?
• "Which Was What Was Wanted", an alternative to Q.E.D.
• 5W Public Relations, a public relations agency
• 5W, production code for the 1982 Doctor Who serial Four to Doomsday

• All pages with titles containing 5W
• W5 (disambiguation)

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