Mundo Novo is a municipality in northeastern Goiás state, Brazil.

Mundo Novo is located in the São Miguel do Araguaia Microregion in the extreme north-west of the state. It is cut by the Rio Palmital, which flows north into the Araguaia River. It has road connections with São Miguel—72 kilometers to the north, Nova Crixás—42 kilometers to the south, and Uirapuru—67 kilometers to the southeast.