The Olenti (; ) is a river in the West Kazakhstan Region, Kazakhstan. It is long and has a catchment area of .
The Olenti belongs to the Ural basin. The name of the river originated in the Kazakh word for sedge.
The Olenti has its sources east of lake Shalkar, in the area between the Caspian Depression and the Mughalzhar Hills (Pre-Ural Plateau). It heads roughly southwestwards across Syrym District. The Buldyrty river flows roughly parallel to the southeast of that stretch. Then the Olenti bends southwards near the village of Saykudyk in Akzhaik District and flows almost straight in that direction. Finally it divides into shallow arms and its waters sink in the sand shortly before reaching lake Tuzdy to the SSE. Its main tributary is the Shiderti from the left.
The river valley is narrow in the upper reaches, widening to in its middle and lower course. It is fed by snow and rain, flowing mainly in March and April after the thaw. In the summer the Olenti stops flowing and breaks up into small pools.
The main fish species in the Olenti include carp, bream, pike and perch.