| R1 | Protolude |
| race | Protolude |
| race_ | Protolude |
| Ratio | Protolude.Base, Protolude |
| Rational | Protolude.Base, Protolude |
| ratioPrec | Protolude.Base, Protolude |
| ratioPrec1 | Protolude.Base, Protolude |
| RatioZeroDenominator | Protolude |
| ratioZeroDenominatorError | Protolude.Base, Protolude |
| Read | Protolude |
| readChan | Protolude |
| readEither | Protolude |
| Reader | Protolude |
| reader | Protolude |
| ReaderT | |
| 1 (Type/Class) | Protolude |
| 2 (Data Constructor) | Protolude |
| readFile | Protolude |
| readMaybe | Protolude |
| ReadMode | Protolude |
| readMVar | Protolude |
| reads | Protolude |
| ReadWriteMode | Protolude |
| Real | Protolude.Base, Protolude |
| RealFloat | Protolude.Base, Protolude |
| RealFrac | Protolude.Base, Protolude |
| realPart | Protolude |
| realToFrac | Protolude.Base, Protolude |
| Rec0 | Protolude |
| RecConError | |
| 1 (Data Constructor) | Protolude |
| 2 (Type/Class) | Protolude |
| recip | Protolude.Base, Protolude |
| RecSelError | |
| 1 (Data Constructor) | Protolude |
| 2 (Type/Class) | Protolude |
| RecUpdError | |
| 1 (Data Constructor) | Protolude |
| 2 (Type/Class) | Protolude |
| reduce | Protolude.Base, Protolude |
| Refl | Protolude |
| rem | Protolude.Base, Protolude |
| Rep | Protolude |
| repeat | Protolude |
| replace | Protolude |
| replicate | Protolude |
| replicateM | Protolude.Monad, Protolude |
| replicateM_ | Protolude.Monad, Protolude |
| repr | Protolude |
| retry | Protolude |
| return | Protolude.Monad, Protolude |
| reverse | Protolude |
| Right | Protolude |
| RightAssociative | Protolude |
| rights | Protolude |
| rightToMaybe | Protolude.Either, Protolude |
| rnf | Protolude |
| rotate | Protolude |
| rotateL | Protolude |
| rotateR | Protolude |
| round | Protolude.Base, Protolude |
| rtsSupportsBoundThreads | Protolude |
| runConcurrently | Protolude |
| runExcept | Protolude |
| runExceptT | Protolude |
| runIdentity | Protolude |
| runInBoundThread | Protolude |
| runInUnboundThread | Protolude |
| runReader | Protolude |
| runReaderT | Protolude |
| runST | Protolude |
| runState | Protolude |
| runStateT | Protolude |