Mass (disambiguation)

The term Mass is used for different concepts, in different fields of study:

Physics
Mass, a physical quantity describing the amount of matter in something (everything it is made of)
Thermal mass, a mass which absorbs heat

Religion
Mass (liturgy), the main worship service of many Christian churches
Mass (music), a piece of music for choir, which is sung during the religious service. The text of this is usually from a religious setting

Music and theatre
Mass (movie), a Tollywood movie starring Akkineni Nagarjuna
Mass (theatre), a 1971 musical play by Leonard Bernstein based on Roman Catholic liturgy
Mass (band), a post-punk band who recorded for the 4AD label
The Mass (band), an American jazzcore band

Placenames and geography
Mass., an abbreviation for the U.S. state of Massachusetts
Landmass (also land mass)

Medicine and health
Body mass index, a health indicator to do with to human body weight and height
Muscle mass, a bodybuilding term to do with the configuration of muscles in a person's body
MASS, the common acronym for sports nutrition company Muscle And Sports Science
Mass (medicine), a tumor

People
Isaac Mass, a Franklin County, Massachusetts politician
Mass, another name for electronic musician Peter Harris, more commonly known as Blu Peter

In the plural form, the masses, can mean: 
 The working class or the people ("the masses"). See also multitudes. Masses are disorganized, as opposed to classes (see class consciousness).
Hoi polloi (or "the masses"), a term that usually refers to ordinary, simple people (not important people like rulers and aristocracy)
The Masses, a Socialist magazine

An adjective describing a large amount of something, as in: 
mass production
mass transit
mass communication
mass education
mass marketing
mass media
mass murder
mass suicide
weapons of mass destruction
mass burial
mass hysteria
mass storage