| Label | LIO.Label, LIO |
| label | LIO.Labeled, LIO |
| Labeled | LIO.Labeled.TCB, LIO.Labeled, LIO |
| LabeledException | LIO.TCB, LIO.Core, LIO |
| LabeledExceptionTCB | LIO.TCB |
| LabeledFunctor | LIO.Labeled, LIO |
| LabeledHandle | LIO.Handle |
| LabeledResult | LIO.Concurrent.TCB, LIO.Concurrent |
| LabeledResultTCB | LIO.Concurrent.TCB |
| LabeledTCB | LIO.Labeled.TCB |
| LabelOf | LIO.Label, LIO |
| labelOf | LIO.Label, LIO |
| labelOfFilePath | LIO.FS.TCB |
| labelOfLabeled | LIO.Labeled.TCB |
| labelOfLIORef | LIO.LIORef.TCB |
| labelOfLMVar | LIO.Concurrent.LMVar.TCB |
| labelP | LIO.Labeled, LIO |
| labelTCB | LIO.Labeled.TCB |
| lazyEncodeLabel | LIO.FS.TCB |
| lBracket | LIO.Concurrent |
| lBracketP | LIO.Concurrent |
| LFilePath | LIO.FS.TCB |
| LFilePathTCB | LIO.FS.TCB |
| lFmap | LIO.Labeled, LIO |
| lFork | LIO.Concurrent |
| lForkP | LIO.Concurrent |
| liftLIO | LIO.TCB, LIO.Core, LIO |
| LineBuffering | LIO.Handle |
| LIO | LIO.TCB, LIO.Core, LIO |
| lioClearance | LIO.TCB, LIO.Core, LIO |
| lioLabel | LIO.TCB, LIO.Core, LIO |
| LIORef | LIO.LIORef.TCB, LIO.LIORef |
| LIORefTCB | LIO.LIORef.TCB |
| LIOState | |
| 1 (Type/Class) | LIO.TCB, LIO.Core, LIO |
| 2 (Data Constructor) | LIO.TCB, LIO.Core, LIO |
| LIOTCB | LIO.TCB |
| LMVar | LIO.Concurrent.LMVar.TCB, LIO.Concurrent.LMVar |
| LMVarTCB | LIO.Concurrent.LMVar.TCB |
| lowerBound | LIO.Label, LIO |
| lresResultTCB | LIO.Concurrent.TCB |
| lresThreadIdTCB | LIO.Concurrent.TCB |
| lub | LIO.Label, LIO |
| lWait | LIO.Concurrent |
| lWaitP | LIO.Concurrent |