R1 or R-1 may be:

• R1 (SEPTA), a commuter rail line in Philadelphia, Pennsylvania
• R1 (New York City Subway car)
• R-1, a post WW-II Russian rocket.
• Yamaha YZF-R1, a motorcycle.
• FN FAL, an assault rifle.
• Reemtsma No. 1, a brand of cigarettes made by Imperial Tobacco.
• BBC Radio 1, a British radio station.
• R-1, an original mecha from Super Robot Wars seires.
• R1 (expert system), an expert system written by John McDermott
• R1 (nuclear reactor), the first nuclear reactor of Sweden
• AEG R.I, a German World War I super-heavy bomber design

R1 | R1