Look up SIR, Sir, or sir in Wiktionary, the free dictionary.

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

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

Organizations

• Sigma Iota Rho, a collegiate honour society for international studies
• Society of Interventional Radiology, an American organization of health professionals
• Sons In Retirement (SIR), a fraternal organization of retired men

Mathematics and statistics

• Sequential Importance Resampling, in mathematics, a particle filtering algorithm
• Signal-to-interference ratio, in telecommunication, the ratio of useful signal versus co-channel interference received
• Short interest ratio, a metric signalling prevailing investors' sentiment
• SIR model, a compartmental model of the progress of an epidemic

Other uses

• SIR proteins (silent information regulator), in molecular biology
• Saskatchewan International Raceway, a Saskatoon drag strip
• Security Industry Registry, a corporate service provided by the New South Wales Police Force
• Siantar railway station, Pematang Siantar, Indonesia (station code: SIR)
• Singapore Infantry Regiment, the main formation of the Singapore Army
• Sion Airport (IATA code: SIR), the airport in Sion, Switzerland
• South Indian Railway, an early Indian railway company
• Staten Island Railway, rapid transit line in the borough of Staten Island, New York, United States
• Statutory Invention Registration, publication of an invention by the United States Patent and Trademark Office
• Surrey Iron Railway, a horse-drawn plateway that linked the former Surrey towns of Wandsworth and Croydon
• Serial Infrared, a category of Infrared Data Association
• Secondary Image Registration, a type of passive autofocus
• Supplemental Inflatable Restraint or airbag, a vehicle safety device

Other uses

• Sır Dam, on the Ceyhan River in Turkey
• Sirene (Sir in Serbian), a type of cheese

See also

• Siir (disambiguation)

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