| Object | Indigo.Internal.Expr.Types, Indigo.Internal.Expr, Indigo.Internal, Indigo |
| ObjectExpr | Indigo.Internal.Expr.Types, Indigo.Internal.Expr, Indigo.Internal, Indigo |
| ObjectManipulation | Indigo.Internal.Expr.Types, Indigo.Internal.Expr, Indigo.Internal, Indigo |
| ObjMan | Indigo.Internal.Expr.Types, Indigo.Internal.Expr, Indigo.Internal, Indigo |
| ObjManipulationRes | Indigo.Internal.Expr.Compilation, Indigo.Internal.Expr, Indigo.Internal, Indigo |
| odd | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| on | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| OnDecodeError | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| One | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| one | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| OneFieldIndigoMCaseClauseL | Indigo.Frontend.Statement |
| OneItem | Indigo.Backend.Prelude, Indigo.Backend.Prelude, Indigo.Prelude, Indigo.Prelude, Indigo, Indigo |
| oneMutez | Indigo.Lorentz, Indigo |
| OnError | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| onException | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| OnStack | Indigo.Internal.Expr.Compilation, Indigo.Internal.Expr, Indigo.Internal, Indigo |
| openFile | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| Operation | Indigo.Lorentz, Indigo |
| operationsVar | Indigo.Internal.Object, Indigo.Internal, Indigo.Compilation, Indigo |
| Ops | Indigo.Internal.Object, Indigo.Internal, Indigo.Compilation, Indigo |
| optimizeLorentz | Indigo.Lorentz, Indigo |
| optimizeLorentzWithConf | Indigo.Lorentz, Indigo |
| Option | |
| 1 (Data Constructor) | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| 2 (Type/Class) | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| optional | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| Or | Indigo.Internal.Expr.Types, Indigo.Internal.Expr, Indigo.Internal, Indigo |
| or | |
| 1 (Function) | Indigo.Backend.Prelude |
| 2 (Function) | Indigo.Internal.Expr.Symbolic, Indigo.Internal.Expr, Indigo.Internal, Indigo |
| Ord | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| ord | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| Ordering | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| ordNub | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| orM | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| otherwise | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| over | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |
| overflowError | Indigo.Backend.Prelude, Indigo.Prelude, Indigo |