Sir is a respectful form of address for a man, and a formal title used in the United Kingdom for knights and baronets.

Sir, SIR or SiR may also refer to:

Places

Iran

  • Sir, Iran, a city in Fars Province
  • Sir, Razavi Khorasan, a village in Razavi Khorasan Province
  • Sir, West Azerbaijan, a village in West Azerbaijan Province

West Bank

  • Sir, Jenin, a Palestinian village in Jenin district
  • Sir, Tulkarm, a Palestinian village in Tulkarm district

Others

  • Sir Creek, on the border between India and Pakistan
  • Sır Dam, on the Ceyhan River in Turkey
  • Saskatchewan International Raceway, a Saskatoon drag strip

People

  • Sir (singer), American singer, songwriter, record producer
  • Jaroslav Šír (born 1923), Czechoslovak former skier
  • József Sir (1912–1996), Hungarian sprinter
  • Sedat Sir (born 1975), Turkish-Australian former Australian Rules footballer

Entertainment

  • Sir (1993 film), a Bollywood film
  • Sir (A Series of Unfortunate Events), a fictional character in A Series of Unfortunate Events
  • Sir (album), by Fischerspooner
  • Sir (2018 film), an Indian Hindi-language romantic drama film
  • "Sir", a song by Nicki Minaj from Queen
  • Sir (2024 film), an Indian Tamil-language action drama film
  • Sir (2025 film), an Indian Odia-language drama film

Organizations

  • Security Industry Registry, a corporate service provided by the New South Wales Police Force
  • Sigma Iota Rho, a collegiate honour society for international studies
  • Singapore Infantry Regiment, the main formation of the Singapore Army
  • Society of Interventional Radiology, an American organization of health professionals
  • Sons In Retirement, a fraternal organization of retired men

Science and technology

  • SIR model, a compartmental model of the progress of an epidemic
  • Secondary image registration, a type of passive autofocus in cameras
  • Sequential Importance Resampling, a particle filtering algorithm
  • Serial Infrared, the physical layer of the IrDA standard for data transmission
  • Short interest ratio, a metric signalling prevailing investors' sentiment
  • Signal-to-interference ratio, the ratio of useful signal versus co-channel interference received
  • Silent information regulator protein involved in regulating gene expression
  • Supplemental inflatable restraint or airbag, a vehicle safety device

Transportation

  • Siantar railway station, Pematang Siantar, Indonesia
  • South Indian Railway, an early Indian railway company
  • Staten Island Railway, rapid transit line in the borough of Staten Island, New York, United States
  • Surrey Iron Railway, a horse-drawn plateway that linked the former Surrey towns of Wandsworth and Croydon
  • Sion Airport, the airport in Sion, Switzerland whose IATA code is SIR

Other uses

  • Sirene (Sir in Serbian), a type of cheese
  • Statutory Invention Registration, a publication of an invention by the United States Patent and Trademark Office
  • Special Intensive Revision, an exercise undertaken by the Election Commission of India to prepare the voters list

See also

  • Siir (disambiguation)