In April 1969, Latin America implemented the first nuclear weapon free zone (NWFZ) in an inhabited region of the world. This article explores the creation of Latin America's NWFZ as a utopian impulse. It argues that various Latin American states used the utopian ideals of security, sovereignty, and socio‐economic prosperity to propel the region's denuclearisation forward. Those implementing these utopian ideals had to define the meaning of Latin America, nuclear weapons under a non‐proliferation agreement, and the denuclearisation of an inhabited region. The result was compromise forged from a collision of utopian ideals and dystopian geopolitics.