COSA is an acronym and may refer to:
- Circles of Support and Accountability, are groups of volunteers with professional supervision to support sex offenders as they reintegrate into society after their release from incarceration
 - Committee on Sustainability Assessment, a non-profit global consortium of institutions, which uses participatory methods to pioneer the scientific measurement of sustainability in agriculture
 - COSA, a 12-step family program of Sex Addicts Anonymous
 - Children's Organization of Southeast Asia (COSA)
 - Colliery Officials and Staffs Area of the National Union of Mineworkers, a British trade union
 - Company of Science and Art
 
See also
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