| Yaa | 0 | Yet Another Assembler | |||
| Yabasic | 0 | ||||
| Yacas | 2000 | ||||
| YACC | 1975 | Grammar and Syntax-oriented | United States | Compiler Compiler | |
| YACC++ | 1993 | United States | OO yacc | ||
| YAFL | 2000 | Belgium | OO 3G language with garbage collection | ||
| YAFOOL | 1986 | France | |||
| Yale Haskell | 1997 | United States | Yale implementation of Haskell | ||
| YALLL | 1979 | United States | High level assembly | ||
| YAMIL | 1980 | ||||
| Yanov flow diagram language | 1957 | Specialised Languages | Flowcharts | Russian Federation | Flowchart language |
| YAOOP | 1996 | Object oriented FORTH | |||
| YAPS | 0 | ||||
| YASOS | 0 | ||||
| Yay | 0 |