The Monrovia High School Drum Line serves as the percussion section of the Marching Wildcats Band and Color Guard. In addition to performing with the Marching Wildcats, the Drum Line prepares its own indoor percussion show for performance through out the Spring semester. This show is taken into competition in regional and national drum line circuits: the American Drum Line Assoc., the Southern California Percussion Alliance, and Winter Guard International.

The MHS Drum Line is a 2-time champion, winning the ADLA Div. Scholastic B championship in 2005 and ADLA Div. Scholastic A championship in 2010. In 2011, The MHS Drum Line took the Bronze in ADLA Open Class. In 2012, Monrovia High served as a competition host for a SCPA contest and looks forward to hosting a 2-day SCPA contest in March 2013.

The Monrovia HS Drum Line is instructed by Jered Sherrill (Front Ensemble) and Eric Shriver (Battery)