Index - R
| Random | Random |
| random | Random |
| RandomGen | Random |
| randomIO | Random |
| randomR | Random |
| randomRIO | Random |
| randomRs | Random |
| randoms | Random |
| range | Ix, Array |
| rangeSize | Ix, Array |
| Ratio | Ratio |
| Rational | Ratio |
| readable | Directory |
| readFile | IO |
| readIO | IO |
| readLitChar | Char |
| readLn | IO |
| ReadMode | IO |
| ReadWriteMode | IO |
| realloc | MarshalAlloc |
| reallocArray | MarshalArray |
| reallocArray0 | MarshalArray |
| reallocBytes | MarshalAlloc |
| realPart | Complex |
| RelativeSeek | IO |
| removeDirectory | Directory |
| removeFile | Directory |
| renameDirectory | Directory |
| renameFile | Directory |
| repeat | List |
| replicate | List |
| resetErrno | CForeign, CError |
| return | Monad |
| reverse | List |
| rotate | Bits |
| rotateL | Bits |
| rotateR | Bits |