| Kauylzhyr | |
| Other Name: | Қауылжыр |
| Source1: | Mugalzhar |
| Source1 Coordinates: | 48.5531°N 58.6003°W |
| Mouth: | Shalkar |
| Mouth Coordinates: | 47.8506°N 59.5378°W |
| Subdivision Type1: | Countries |
| Subdivision Name1: | Kazakhstan |
| Length: | 142km (88miles) |
| Basin Size: | 1810km2 |
| Pushpin Map: | Kazakhstan |
| Pushpin Map Caption: | Mouth location in Kazakhstan |
The Kauylzhyr (kk|Қауылжыр; ru|Каульжур) is a river in Shalkar District, Aktobe Region, Kazakhstan. It is long and has a catchment area of .
The river is part of the Shalkar Basin. It is fed mainly by snow. Its waters are used to water livestock.
The Kauylzhyr has its sources on the southeastern slopes of the Mugalzhar Hills. It heads roughly southeastwards most of its course. In its final stretch it bends southwards and enters lake Shalkar from the north.[1] [2] [3]
The width of the river channel is between 50m (160feet) and 150m (490feet). The main tributaries of the Kauylzhyr are the Alabassay, Karabulaksay, Sarysay and Koganzhar.
