R1, R.I, R01 or R-1 may refer to:

Military equipment [link]

• 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
• 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

Transport [link]

• R1 motorway (Belgium), a ring road around Antwerp
• R1 expressway (Czech Republic), an expressway in Czech Republic
• R-1 road (Philippines), a road connecting the centre of Manila and Pasay City
• R1 expressway (Slovakia), a road connecting Trnava and Banská Bystrica
• R-1 motorway (Spain), a future radial motorway connecting Madrid and El Molar
• 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
• Beriev R-1, a 1952 Soviet turbojet-powered flying boat
• Jaguar R1, the chassis with which the Jaguar Racing Formula One team competed in the 2000 Formula One season
• 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
• Subaru R1, a car
• Yamaha YZF-R1, a motorcycle
• International Air Transport Association code for Sirin (airline)

Computing [link]

• 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 1959–1971

Biology [link]

• 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
• R01 : Cardiac murmurs and other cardiac sounds ICD-10 code

Other [link]

• R1 Club, R1 Club or R1 Group, a leading provider of luxury and executive services in the Asia-Pacific region
• R1: Explosive when dry, a risk phrase
• R1 Multi-frequency signaling, a telephony control technique
• R1 (nuclear reactor), the first nuclear reactor of Sweden
• R-1 (singer), a rapper from the Dominican Republic
• R1 space in topology, in mathematics
• 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
• BBC Radio 1, a national radio station in the United Kingdom
• R1 or RI, Research I university
• Radio One (New Zealand) a New Zealand student radio station

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.