Sir (disambiguation)

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:

• 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

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

• Sir Creek, on the border between India and Pakistan
• Sır Dam, on the Ceyhan River in Turkey
• Saskatchewan International Raceway, a Saskatoon drag strip
• Siantar railway station, Pematang Siantar, Indonesia
• Sion Airport, the airport in Sion, Switzerland
• 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

• 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

• 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

• 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
• South Indian Railway, an early Indian railway company

• 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

• Sirene (Sir in Serbian), a type of cheese
• Statutory Invention Registration, a publication of an invention by the United States Patent and Trademark Office

• Siir (disambiguation)