The Oregon Marching Band (OMB) is the marching band of the University of Oregon in Eugene, Oregon, United States. With over 250 members, it is the largest student organization on campus, and its members come from nearly every department and major at the university. The marching band serves as the foundation for the larger Oregon Athletic Bands organization that includes the Oregon Basketball Band, Winter Drumline, and the Green and Yellow Garter Bands.

The OMB performs at all home football games at Autzen Stadium, selected away games, and bowl games. Some of the OMB's recent travels have taken them to Seattle, Washington; Pullman, Washington; Las Vegas, Nevada; El Paso, Texas; San Diego, California; Pasadena, California; Glendale, Arizona; Palo Alto, California; Santa Clara, California; and San Antonio, Texas. Other aspects of Oregon athletics, such as women's volleyball, are also supported by the OMB.[1] The OMB also hosts a large high school marching band competition every fall known as the Festival of Bands.