Alexander "Aleco" Christakis (Greek: Αλέξανδρος Χρηστάκης; born 1937) is a Greek American social scientist, systems scientist and cyberneticist, former faculty member of several Universities, organizational consultant and member of the Club of Rome, known for his "study and design of social systems".

In 1968 he was co-founder of the Club of Rome, where he was a collaborator of Aurelio Peccei, Erich Jantsch and Hasan Özbekhan.

He also spent five years at George Mason University as the Director of the Center for Interactive Management headed by John N.

The Institute for 21st Century Agoras is credited for the formalization of the science of Structured dialogic design in its present form.

He and Laouris led the implementation of series of mass scale dialogues using the structured dialogic design process in the Civil Society Dialogue project in Cyprus and in the Act Beyond Borders project in Middle East.