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

• Cosa