Livio Vacchini (February 27, 1933 - April 2, 2007) was a Swiss architect from Ticino. Livio Vacchini was born in Locarno. From 1953 to 1958 he studied architecture at Swiss Federal Institute of Technology in Zurich. After a stay in Stockholm and Paris from 1959 to 1961, he established his own architecture studio in Locarno called Studio Vacchini architetti, working closely with Luigi Snozzi.

The works of Livio Vacchini feature an extreme coherence of theme and practice. Each project is conceived ideally as the continuation of the lines of research explored by modern architects of the classical tradition, like Auguste Perret, Ludwig Mies van der Rohe and Louis I Kahn. An extreme reduction of structural elements is present in all his designs . The most important values of his works lie precisely in their intentional "untimeliness" : indifferent to novelty, interested only in respecting an inner coherence, detached, far from the chatter and gossip of the world of architecture of our time.