| Moordener Kill | |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | New York |
| Subdivision Type3: | County |
| Subdivision Name3: | Rensselaer |
| Subdivision Type4: | Towns |
| Subdivision Name4: | Sand Lake, Schodack |
| Source1 Location: | Sand Lake, New York |
| Source1 Coordinates: | 42.6058°N -73.5861°W |
| Mouth: | Hudson River |
| Mouth Location: | Castleton-on-Hudson, New York |
| Mouth Coordinates: | 42.5433°N -73.7539°W |
| Mouth Elevation: | 0feet |
The Moordener Kill is a 15.5adj=midNaNadj=mid[1] tributary to the Hudson River that flows through southwestern Rensselaer County, New York, in the United States.
Moordener Kill translates to "Murderer Creek", with moordenaar being the modern Dutch word for "murderer" and kill for "creek".[2] The name comes from the creek having been the site of an ambush of Dutch settlers by Native Americans in 1643 in which seven men and two women were killed.[3]