503 may refer to:
- 503 (number)
- 503, a year
- 503, a track by Hans Zimmer on the Angels & Demons soundtrack
- 503 Service Unavailable, an HTTP status code
- Area code 503, a North American telephone area code in northwestern Oregon
- BMW 503, a grand tourer
- Fiat 503, a small family car
- Country code +503, for El Salvador
- FN 503, a semi-automatic pistol manufactured by FN Herstal
- A type of jeans, commonly in Levi's and Edwin
- A type of steel used for making bicycle frames
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This disambiguation page lists articles associated with the same number.
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