- RF switches
- RFC
- RFCs
- RFIC
- RFID
- RFLP
- RFM
- RFNA
- RFP
- RGD motif
- RGGI
- RHA
- RHEED
- RHU
- RHex
- RINEX
- RIP
- RIS
- RISC
- RIXS
- RKHS
- RL
- RL circuit
- RLC circuit
- RLE
- RLWE
- RMS
- RMSD
- RNA
- RNA Integrity Number
- RNA editing
- RNA hydrolysis
- RNA polymerase
- RNA polymerase II
- RNA silencing
- RNA structure
- RNA viruses
- RNA-binding proteins
- RNA-seq
- RNAV
- RNAi
- RNFL
- RNG
- RNN
- RNP
- RNS
- RNase H
- RNase P
- ROC
- ROI