Carlos Isaac Muñoz Obejero (born 30 April 1998), known as Carlos Isaac, is a Spanish footballer who plays as a right back for Atlético Madrid B.
Born in Navalmoral de la Mata, Cáceres, Extremadura, Carlos Isaac joined Atlético Madrid's youth setup in 2015 at the age of 17, from CD Diocesano. He made his senior debut with the reserves on 10 September 2017, starting in a 1–1 Segunda División B home draw against Celta de Vigo B.
On 9 March 2018, Carlos Isaac renewed his contract until 2020. His La Liga debut came the following 1 April, as he started in a 1–0 home win against Deportivo de La Coruña.