The Attoyac Bayou (/ˈætəjæk/ AT-ə-yak) is a river in eastern Texas. As to the naming, the locals, historical records, and the state of Texas use the phrase 'bayou' but, since 1984, the USGS uses the term 'river'. It flows through Nacogdoches, San Augustine, Shelby and Rusk counties of east Texas. It is a tributary to the Angelina River which it enters within the Sam Rayburn Reservoir.

• List of rivers of Texas

• "An Analysis of Texas Waterways". Archived from the original on 3 May 2006. Retrieved 2006-05-04.
• USGS Hydrologic Unit Map - State of Texas (1974)

31°42′40″N 94°24′52″W / 31.7110°N 94.4145°W / 31.7110; -94.4145