| UInfixE | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| uInfixE | Language.Haskell.TH.Lib, Language.Haskell.TH | 
| UInfixP | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| uInfixP | Language.Haskell.TH.Lib, Language.Haskell.TH | 
| UnboxedTupE | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| unboxedTupE | Language.Haskell.TH.Lib | 
| unboxedTupleDataName | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| UnboxedTupleT | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| unboxedTupleT | Language.Haskell.TH.Lib | 
| unboxedTupleTypeName | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| UnboxedTupP | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| unboxedTupP | Language.Haskell.TH.Lib | 
| Uniq | Language.Haskell.TH.Syntax | 
| Unlifted | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| unopPrec | Language.Haskell.TH.Ppr | 
| Unpacked | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| unpacked | Language.Haskell.TH.Lib | 
| unQ | Language.Haskell.TH.Syntax | 
| Unsafe | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| unsafe | Language.Haskell.TH.Lib, Language.Haskell.TH | 
| unsafeTExpCoerce | Language.Haskell.TH.Syntax | 
| unType | Language.Haskell.TH.Syntax, Language.Haskell.TH | 
| unTypeQ | Language.Haskell.TH.Syntax |