504 may refer to:
- 504, a year
- Avro 504, a World War 1 era biplane aircraft built by A. V. Roe and Company,
- Peugeot 504, a car
- Area code 504
- Section 504 of the Rehabilitation Act, which protects Americans with disabilities from discrimination by any entity that receives Federal funding.
- HTTP status code 504
- 504 King, a streetcar route operated by the Toronto Transit Commission
- No. 504 (County of Nottingham) Squadron, RAuxAF
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