- Rudolph Arthur
- Ronald George Wreyford Norrish
- Rodney Roberta Porter
- Robert Wilhelm Bunsen
- Robert Sanderson Mulliken
- Robert Robinson
- Robert Floyd Curl, Jr.
- Robert Burns Woodward
- Roald Hoffmann
- Richard Zsigmondy
- Richard Robert Ernst
- Richard Martin Willstatter
- Richard Kuhn
- Richard Smalley Errett
- Reginald Patrick Linstead
- Pierre Lecomte Du Nouyovej Lecomte Du Nouyovej
- Peter Joseph William Debye
- Peter Dennis Mitchell
- Paul Sabatier
- Paul Karrer Karrer
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