R
- Michael O. Rabin – nondeterministic machines
- Dragomir R. Radev – Natural Language Processing, Information Retrieval
- T. V. Raman – accessibility, Emacspeak, etc.
- Brian Randell – dependability
- Yoav Raz – databases: commitment ordering (or commit ordering) for guaranteeing distributed and global serializability
- Raj Reddy – AI
- David P. Reed
- John C. Reynolds
- Joyce K. Reynolds – Internet
- Adam Riese
- C. J. van Rijsbergen
- Dennis Ritchie – C (programming language), UNIX
- Ron Rivest – RSA, MD5, RC4
- Colette Rolland – REMORA methodology, meta modelling
- Azriel Rosenfeld
- Douglas T. Ross – Structured Analysis and Design Technique
- Guido van Rossum – Python (programming language)
- Winston W. Royce – Waterfall model
- Rudy Rucker – mathematician, writer, educator
- Steven Rudich – complexity theory, cryptography
- Jeff Rulifson
- James Rumbaugh – Unified Modeling Language, Object Management Group
- Juan Manuel Ramirez – researcher and writer, Open Source Software Technologies
Read more about this topic: List Of Computer Scientists