The Wat Ta Yom River () is a tributary of the Nan River in Thailand.
This river of many names originates in the mountains of the Noen Maprang District of Phitsanulok Province where it is referred to as the Chomphu River (Thai: à ¸Âà ¸¥à ¸Âà ¸Âà ¸Âà ¸¡à ¸ à ¸¹). It then flows through the Wang Thong District where it is referred to as the Tha Muen Ram River (Thai: à ¹Âà ¸Âà ¸§à ¸Âà ¹Âà ¸³à ¸Âà ¹Âà ¸²à ¸«à ¸¡à ¸·à ¹Âà ¸Âà ¸£à ¸²à ¸¡), then flows through the Bang Krathum District, and through Wat Ta Yom, where it is referred to as the Wat Ta Yom River. It discharges into the Nan River in Phichit via the Tha Luang Canal (Thai: à ¸Âà ¸¥à ¸Âà ¸Âà ¸Âà ¹Âà ¸²à ¸«à ¸¥à ¸§à ¸Â) at .
All of the above names of the river derive from the names of places through which the river flows or to which it leads. The river does not appear to have a geographically independent name of its own.
The following is a tree demonstrating the points at which the major tributaries of the Tha Luang River branch off from the main river and from each other.