Matteo Ciacci (born May 5, 1990)^[1] is a Sammarinese politician, who served as one of the Captains Regent, along with Stefano Palmieri. He took office on 1 April 2018 and served until 1 October 2018.^[2]

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He worked as an official and sports manager. Ciacci studied law at the University of Urbino. At the time of his appointment, he was the youngest serving state leader in the world, being the first to be born in the 1990s and after the fall of the Berlin Wall.