| Failure | Options.Applicative.Types, Options.Applicative.Extra, Options.Applicative |
| failureCode | Options.Applicative.Builder, Options.Applicative |
| fieldMod | Options.Applicative.Builder.Internal |
| fill | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| fillBreak | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| fillCat | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| fillSep | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| filterOptional | Options.Applicative.Types |
| first | Options.Applicative.Arrows |
| flag | Options.Applicative.Builder, Options.Applicative |
| flag' | Options.Applicative.Builder, Options.Applicative |
| flagActive | Options.Applicative.Builder.Internal |
| FlagFields | |
| 1 (Type/Class) | Options.Applicative.Builder.Internal, Options.Applicative.Builder, Options.Applicative |
| 2 (Data Constructor) | Options.Applicative.Builder.Internal |
| flagNames | Options.Applicative.Builder.Internal |
| FlagReader | Options.Applicative.Types |
| flatAlt | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| float | Options.Applicative.Help.Pretty, Options.Applicative.Help |
| footer | Options.Applicative.Builder, Options.Applicative |
| footerDoc | Options.Applicative.Builder, Options.Applicative |
| footerHelp | Options.Applicative.Help.Core, Options.Applicative.Help |
| ForwardOptions | Options.Applicative.Types |
| forwardOptions | Options.Applicative.Builder, Options.Applicative |
| fromM | Options.Applicative.Types |
| fullDesc | |
| 1 (Function) | Options.Applicative.Help.Core, Options.Applicative.Help |
| 2 (Function) | Options.Applicative.Builder, Options.Applicative |