509 may refer to:
- 509 (number)
- 509, the year
- 509 Harbourfront, a streetcar route in Toronto
- 509th Operations Group, the 509th Operations Group of the USAAF
- 509 error, an unofficial HTTP response code meaning bandwidth exceeded
- Area code 509, a telephone area code
- FN 509, a semi-automatic pistol manufactured by FN Herstal
- x.509, a public key infrastructure certificate standard
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