The Bolgasyn () 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. In the spring the Bolgasyn is used to water local livestock.
Course The Bolgasyn has its sources in the Shagyray Plateau, part of the southern sector of the Mugalzhar Hills. It heads first southeastwards, parallel to the upper course of the Kauylzhyr river that flows a little to the south, to the northwest of lake Shalkar. In its middle course the river bends eastwards and in its final stretch it bends northeastwards, entering lake Tebez from the southwest.Google EarthNature of Kazakhstan Encyclopedia / General editor. B. O. Jacob. - Almaty: "Kazakh Encyclopedia" LLP, 2011. T.Z. - 304 pages. ISBN 9965-893-64-0 (T.Z.), ISBN 9965-893-19-5
The Bolgasyn usually reaches its highest level for a few weeks in March and April when the snows melt. By May it splits into separate ponds and then dries up completely even before the summer. Its floodplain has 38 small tributaries with a total length of .
See also List of rivers of Kazakhstan
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