| Year | Data.Time.Calendar.OrdinalDate, Data.Time.Calendar.Julian, Data.Time.Calendar.WeekDate, Data.Time.Calendar, Data.Time |
| YearDay | Data.Time.Calendar.OrdinalDate |
| yearFormat | Data.Time.Format.ISO8601 |
| YearMonth | Data.Time.Calendar.Month |
| YearMonthDay | Data.Time.Calendar, Data.Time |
| yearMonthFormat | Data.Time.Format.ISO8601 |
| YearQuarter | Data.Time.Calendar.Quarter |
| YearWeekDay | Data.Time.Calendar.WeekDate |
| yearWeekFormat | Data.Time.Format.ISO8601 |
| Yellow | System.Console.Terminfo.Color, System.Console.Terminfo |
| yellow | Text.XHtml.Transitional, Text.XHtml |
| YHC | Distribution.Simple.Compiler, Distribution.Simple, Distribution.Compiler |
| Yield | Data.Text.Internal.Fusion.Types, Data.Text.Internal.Fusion |
| yield | GHC.Conc, GHC.Conc.Sync, Control.Concurrent, GHC.Internal.Conc.Sync |
| yield# | |
| 1 (Function) | GHC.Base, GHC.Exts, GHC.Internal.Base, GHC.Internal.Exts, GHC.Prim |
| 2 (Function) | GHC.PrimopWrappers |
| Yield1 | Data.ByteString.Builder.Internal |
| YPL_1_0 | Distribution.SPDX.LicenseId, Distribution.SPDX |
| YPL_1_1 | Distribution.SPDX.LicenseId, Distribution.SPDX |
| yPos | System.Win32.Console, System.Win32.WindowsString.Console, System.Win32 |