Plaza Fabini, or Plaza Ingeniero Juan Pedro Fabini, also known as Plaza del Entrevero, is a square of the Uruguayan capital, Montevideo. It is located on Montevideo's main avenue, 18 de Julio Avenue, in the barrio of Centro and on its north side starts Libertador Avenue.

Its main fountain has a big bronze sculpture of José Belloni called El Entrevero, which has given the nickname to the square. Under the square, there is a municipal exposition area called Subte Municipal.