| Rank | Abbreviation | Meaning |
|---|
| ***** | RCSL | RealNetworks Community Source License
| |
| **** | RCSL | Revenue & Customs Sports & Leisure
| |
| **** | RCSL | RPG Cellular Services Ltd. (India)
| |
| **** | RCSL | RPG Cellular Services Limited
| |
| *** | RCSL | Rancho California Soccer League
| |
| *** | RCSL | Redeemable Convertible Subordinated Loan
| |
| *** | RCSL | Reliance Consultancy Services Limited
| |
| *** | RCSL | Regional Centre for Science Learning
| |
| *** | RCSL | Recombinant Chromosome Substitution Lines
| |
| *** | RCSL | Rocket City Swim League
| |
| ** | RCSL | Research Committee Sociology of Law
| |
| ** | RCSL | Raymond Chan Surveyors Limited
| |
| ** | RCSL | Richmond Corporate Services Ltd
| |
| ** | RCSL | Robayne Computing Services Ltd. (est. 1993; UK)
| |
| ** | RCSL | RealNetworks Community Source Licensing
| |
| ** | RCSL | Reverse Charge Sales List
| |
| * | RCSL | Renaissance City Softball League
| |
| * | RCSL | Rugby Canada Super League
| |
| * | RCSL | Russian Computer Sports League
| |
| * | RCSL | Regional Counter-Strike League (computer game league; Russia)
| |
| * | RCSL | Remote Control Search Lights
| |
| * | RCSL | Rose Corrosion Services Limited
| |
| * | RCSL | Ramco Celtic Sea Limited
| |
| * | RCSL | Reactor Core Safety Limits
| |
| * | RCSL | Relational Continuity Sockets Layer
| |