Charles Cosac (Rio de Janeiro, 1964) is a Brazilian academic, art collector, literary editor and businessman in the publishing sector. In 1997, he founded the publishing company Cosac & Naify in São Paulo, alongside his brother-in-law Michael Naify, and was in charge of the business until the company closed its activities in 2015.

Charles Cosac (Rio de Janeiro, 1964) é um acadêmico, colecionador de arte, editor literário e empresário brasileiro do setor editorial. Em 1997, fundou em São Paulo, ao lado de seu cunhado Michael Naify, a editora Cosac & Naify, e esteve à frente do negócio até o encerramento das atividades da empresa, em 2015