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) The R-1 rocket (NATO reporting name SS-1 Scunner, Soviet code name SA11, GRAU index 8A11) was a tactical ballistic missile, the first manufactured in the Soviet Union, and closely based on the German V-2 rocket. The R-1 missile system entered int ...

, 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 The FAL (, English: Light Automatic Rifle) is a battle rifle designed in Belgium by Dieudonné Saive and manufactured by FN Herstal and others since 1953. During the Cold War the FAL was adopted by many countries of the NATO, North Atlantic Trea ...

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 Rivian Automotive, Inc., is an American electric vehicle manufacturer and automotive technology company founded in 2009. Rivian produces an electric sport utility vehicle (SUV), a pickup truck on a Skateboard (automotive platform), "skateboard" ...

, R1S and R1T, an American electric mid-size SUV and pickup truck * SIN R1, a Bulgarian sports car *

Subaru R1 The Subaru R1 is a kei car manufactured by the Japanese carmaker Subaru from 2005 to 2010. Design Entering production on January 4, 2005, the R1 is a two-door version of the Subaru R2, but with a shorter body and wheelbase. The R1 is unusual in ...

, a Japanese city car

Aviation

* Beriev R-1, a 1952 Soviet turbojet-powered flying boat *

International Air Transport Association The International Air Transport Association (IATA ) is an airline trade association founded in 1945. IATA has been described as a cartel since, in addition to setting technical standards for airlines, IATA also organized tariff conferences tha ...

code for Sirin (airline)

Motorcycles

* Yamaha YZF-R1, a motorcycle

Rail

Lines

* R1 (SEPTA), a former commuter rail line in Philadelphia, Pennsylvania, which was split into: ** Airport Line (SEPTA), or R1 Airport line **

SEPTA Main Line The SEPTA Main Line is the section of the SEPTA Regional Rail system from the Zoo Interlocking in West Philadelphia to Lansdale Station in Lansdale, Pennsylvania. The line is long, and serves all 13 SEPTA Regional Rail lines. Service Serv ...

''(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

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: Explosive when dry, a risk phrase * R-1 Federation * Rogue One, a 2016 film * R1

Multi-frequency signaling In telephony, multi-frequency signaling (MF) is a type of signaling that was introduced by the Bell System after World War II. It uses a combination of audible tones for address (telephone number) transport and supervision signaling on trunk li ...

, a telephony control technique * R1 (nuclear reactor), the first nuclear reactor of Sweden * R₁ space in topology, in mathematics *

R-1 visa The R-1 visa is a non-immigrant visa which allows travel to the United States for service as a minister or other religious occupation. Between October 2019 and September 2020, there were 2,399 R visas issued. Qualifications for the religious o ...

, a non-immigrant visa which allows travel to

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

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 Imperial Brands plc (originally the Imperial Tobacco Company of Great Britain & Ireland, and subsequently Imperial Tobacco Group plc) is a British Multinational corporation, multinational tobacco company headquartered in Bristol, England. It is ...

* Region 1, the

DVD region code DVD region codes are a digital rights management technique introduced in 1997. It is designed to allow rights holders to control the international distribution of a DVD release, including its content, release date, and price, all according to t ...

for United States, Canada, Bermuda, U.S. territories *

Research I university This is a list of universities in the United States classified as research universities in the Carnegie Classification of Institutions of Higher Education. Research institutions are a subset of doctoral degree-granting institutions and conduc ...

, a designation of U.S. universities engaged in the highest levels of research activity *

BBC Radio 1 BBC Radio 1 is a British national radio station owned and operated by the BBC. It specialises in modern popular music and Contemporary hit radio, current chart hits throughout the day. The station provides alternative genres at night, including ...

, 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 A portable media player (PMP) or digital audio player (DAP) is a portable consumer electronics device capable of storing and playing digital media such as audio, images, and video files. Normally they refer to small, battery-powered devices ...

* Rabbit r1, an AI-based personal assistant device