Marysville Joint Unified School District (MJUSD) is a school district in California, United States, headquartered in Marysville.
It includes areas of Yuba County, including the municipality of Marysville, as well as the following census-designated places: Challenge-Brownsville, Dobbins, Linda, Loma Rica, Olivehurst, and a part of Plumas Lake. The district extends into Butte County, where it covers Clipper Mills and Forbestown.
In 2003 Marysville JUSD gave territory to Plumas Elementary School District and Wheatland Union High School District.