Tomás Berreta Gandolfo (November 22, 1875 – August 2, 1947) was the President of Uruguay for five months in 1947.

Having been an activist in the Uruguayan Colorado Party since 1896, for a number of years he was active in local politics and served as Intendent of Canelones in the early part of the 20th century.

Berreta was thus a prominent, elderly member of the Uruguayan Colorado Party which had ruled the country for long periods, when he stood for election as President, with a view to succeeding the sitting President of Uruguay, Juan José de Amézaga, who was younger than he by several years.

A longstanding military man by profession, President Berreta was notably responsible for founding the Liceo Militar General Artigas, Montevideo, a secondary school in the nation's capital to be run on military lines.

Berreta died in office barely five months later on 2 August 1947 from prostate cancer.