The abbreviation RSX stands for:
- Rhein-Sieg-Express , a regional express line in North Rhine-Westphalia and Rhineland-Palatinate
- first Real-Time System Executive , then Resource Sharing Executive at RSX-11
- Rally Sport eXperimental for the Acura RSX car model
- the graphics processor of the PlayStation 3 game console , see RSX 'Reality Synthesizer'
- Agfachrome RSX , a professional slide film material from Agfa
- the former entry-level racing bike gears from Shimano
- the content management system "Remote Site eXchange"
- resident system extension , see Locomotive BASIC and CP / M
- RS: X , an Olympic windsurfing boat class