R1, R.I., R01 or R-1 may refer to:
Biology R1 plasmid, a plasmid found in E Coli ATC code R01 Nasal preparations, a subgroup of the Anatomical Therapeutic Chemical Classification System Haplogroup R1 (Y-DNA), a human Y-chromosome DNA haplogroup The R1 vein in insect wings
Computing DeepSeek-R1, an open-source large language model released by DeepSeek in January 2025 R1 (expert system), a 1978 expert system written by John McDermott .r01, a RAR file extension an alternate name for the Rice Institute Computer, an innovative computer extant at Rice University from 1959 to 1971
Military equipment R-1 tank, a Romanian tank from World War II R-1 (missile), a post World War II Russian rocket AEG R.I, a 1918 German super-heavy bomber design DFW R.I, a 1916 German prototype bomber aircraft HMS Caprice, a destroyer originally designated with Pennant Number R01 Linke-Hofmann R.I, a World War I German prototype bomber aircraft Polikarpov R-1, a Soviet Union copy of the 1931 British Airco DH.9A light bomber aircraft USS R-1 (SS-78), a 1918 United States Navy R-class coastal and harbor defense submarine a South African made version of the FN FAL battle rifle a version of the 1942 German Rheintochter ground-to-air missile Sentinel R1, a British airborne radar platform a Romanian designation of the Czechoslovak-designed tankette AH-IV
Transportation Automobiles Jaguar R1, a British 1999 Formula One racing car Javan R1, a British sports car Nuro R1, an American autonomous van Ora R1, a Chinese electric city car Praga R1, a Czech sports car Rivian, R1S and R1T, an American electric mid-size SUV and pickup truck SIN R1, a Bulgarian sports car Subaru R1, a Japanese city car
Aviation Beriev R-1, a 1952 Soviet turbojet-powered flying boat International Air Transport Association code for Sirin (airline)
Motorcycles Yamaha YZF-R1, a motorcycle
Rail Lines R1 (Canberra), a light rail line between Gungahlin and Alinga Street, Australian Capital Territory R1 (SEPTA), a former commuter rail line in Philadelphia, Pennsylvania, which was split into: Airport Line (SEPTA), or R1 Airport line SEPTA Main Line (R1 Glenside), also called the Glenside Combined R1–RG1 (Rodalies de Catalunya), a commuter rail line in Catalonia, Spain R1 King George Blvd, RapidBus line in Surrey (Metro Vancouver, British Columbia, Canada) R1 (RER Vaud), an S-Bahn line in the canton of Vaud Line R1 (Xiamen Metro), China
Individual locomotive and multiple-unit classes LCDR R1 class, a class of 0-4-4T steam locomotives built by the South Eastern and Chatham Railway to modified LCDR design in 1900 LNER Class R1, a class of British steam locomotives PRR R1, a 1934 American single prototype electric locomotive R1 (New York City Subway car), an American rapid transit multiple-unit SECR R1 class, a class of 0-6-0T steam locomotives rebuilt by the South Eastern and Chatham Railway from the SER R class between 1910 and 1922
Roads R1 expressway (Czech Republic), an expressway in the Czech Republic R1 expressway (Slovakia), a road connecting Trnava and Banská Bystrica R1 ring road (Belgium), a ring road around Antwerp R-1 motorway (Spain), a future radial motorway connecting Madrid and El Molar R1 road (Zimbabwe), a road connecting Beitbridge and Harare Radial Road 1 or R-1, an arterial road of Manila, Philippines
Other R01 grant, a form of competitive funding issued by the National Institutes of Health in the United States R1 institution, a level of research activity on the Carnegie Classification of Institutions of Higher Education R1: Explosive when dry, a risk phrase R-1 Federation Rogue One, a 2016 film R1 Multi-frequency signaling, a telephony control technique R1 (nuclear reactor), the first nuclear reactor of Sweden R1 space in topology, in mathematics R-1 visa, a non-immigrant visa which allows travel to United States for service as a minister or other religious occupation. DSC-R1, a 2005 Sony Cyber-shot R series camera R1, a brand sold by Imperial Tobacco Region 1, the DVD region code for United States, Canada, Bermuda, U.S. territories Research I university, a designation of U.S. universities engaged in the highest levels of research activity BBC Radio 1, a national radio station in the United Kingdom Radio One (New Zealand) a New Zealand student radio station Samsung YP-R1, a digital audio player Rabbit r1, an AI-based personal assistant device Unitree R1, a humanoid robot developed by Unitree Robotics DeepSeek R1, a large language model created by DeepSeek
See also 1R (disambiguation)