# R1

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 (New York City Subway car)
* 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

#### Individual locomotive 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
* PRR R1, a 1934 American single prototype electric locomotive
* 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
* LNER Class R1, a class of British steam locomotives

### 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, a telephony control technique
* R1 (nuclear reactor), the first nuclear reactor of Sweden
* R$_1$ 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
* TV R1, Czech regional television station
* 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