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
 - 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
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