| Illinois Mountain | |
| Location: | Lloyd, New York, U.S. |
| Coordinates: | 41.7203°N -73.995°W |
| Coordinates Ref: | [1] |
| Topo: | USGS Poughkeepsie |
| Map: | New York#USA |
Illinois Mountain is a 1125adj=midNaNadj=mid mountain located south of the Catskill Mountains of New York west of Poughkeepsie. Illinois Mountain is north of Marlboro Mountain.