Mass of the Fermenting Dregs (マス オブ ザ ファーメンティング ドレッグス) was an alternative rock trio formed in Kobe, Japan in 2002. They are also popularly known by a shortened form of their name, Masu Dore (マスドレ). They are known for a tightly arranged, guitar-driven style, melodic pop vocals and a high-energy stage presence at their live events. They were signed to the Japanese indie rock record label AVOCADO Records from the release of their self-titled EP in January 2008. The band announced their disbandment on September 1, 2012.

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