Manab Adhikar Sangram Samiti (MASS), (Assamese মানৱ অধিকাৰ সংগ্ৰাম সমিতি), is a regional non-profit human rights NGO in Assam. It was founded in 1991 by Parag Kumar Das along with a group of intellectuals and journalists of Assam. The present chairman is Ajit Kumar Bhuyan and its headquarters is at Bamunimoidam, Guwahati.

In physics, mass is a property of a physical body. It is generally the amount of matter of an object. It is determined by the strength of its mutual gravitational attraction to other bodies, its resistance to being accelerated by a force, and in the theory of relativity gives the mass–energy content of a system. The SI unit of mass is the kilogram (kg).