Rx or most commonly refers to a medical prescription.
RX, Rx, , or rx may also refer to:
Arts and entertainment or Rx, a novel by Elizabeth J. Braswell writing as Tracy Lynn Rx (band), an industrial rock band Rx, a 2016 album by Ryan Beaver Rx, a 2024 album by Galantis "Rx (Medicate)", a song by Canadian rock band Theory of a Deadman "rX" (The Gifted), an episode of the television series The Gifted Kamen Rider Black RX, a Japanese superhero television series Rx (film), a 2005 romantic thriller film
Science and technology Computing and electronics Rx (receive, receiver or reception), in various telecommunications applications Rx, the receive signal in the RS-232 serial communication standard Rx, the remote procedure call mechanism used by the Andrew File System RX, the audio repair software by iZotope Radeon RX series, a series of graphics products in the AMD Radeon 400 series Reactive extensions, originally for .NET, later ported to other languages and environments Rx bridge, a device for measuring the characteristic resistance and impedance of antenna or feedline system RX meter, a term used in electrical engineering RX microcontroller family, by Renesas Electronics
Vehicles Lexus RX, a series of luxury crossover SUV Mazda RX, a series of sport cars South Australian Railways R class (Rx class locomotive), of the South Australian Railways Yamaha RX 100, a 2-stroke Yamaha motorcycle
Other science and technology Retinal homeobox protein Rx, a transcription factor in vertebrate eye development Roket Eksperimental, an Indonesian experimental rocket series
Organisations Regent Airways (former IATA code: RX), a former Bangladeshi airline Riyadh Air (IATA code: RX), a Saudi airline RX, formerly Reed Exhibitions, an exhibition company now part of RELX
Other uses Monster RX 93.1, Philippine radio station Prescribed burn (Rx burn), in forest management Rallycross, a motor sport Rye, East Sussex (fishing boat registrations: RX), UK , a numismatic abbreviation for reverse