| Abbreviation | Definition |
|---|---|
| RCS | Radio Conference Subcommittee |
| RCSC | Renaissance Conference of Southern California |
| RDAC | Rare Disease Asia Conference |
| RDAW | Rochester Deaf Awareness Week |
| RDCC | Regional and Distribution Carriers Conference |
| RDMC | Railway Diagnostic and Monitoring Conference |
| RE2020 | Requirements Engineering (for a Digital World, IEEE Conference) |
| REAL | REAL-Time Systems Symposium |
| REBEC | Real Estate Belgrade Exhibition Conference |
| REC | Revenue Estimating Conference |
| REC | ruitment and Employment Confederation |
| RECCA | Regional Economic Cooperation Conference on Afghanistan |
| REDW | IEEE Radiation Effects Data Workshop |
| REEC | Regional Environmental Enrichment Conferences |
| RELDIS | Symposium on RELiability in DIstributed Software and Database Systems |
| RELPHY | International RELiability PHYsics Symposium |
| REPC | Rural Electric Power Conference |
| REPCON | Rural Electric Power CONference |
| RER | Real Estate Roundtable |
| RERC | Rare Earth Research Conference |