The Walls Have Ears (Spanish: Las paredes oyen) is a play written by the Spanish playwright Juan Ruiz de Alarcón. It was first staged in 1617, but it was not published until 1628 in the first part of Alarcón’s collected plays. A manuscript of the work was discovered in 1882 in the Library of the Duke of Osuna. It is one Alarcón's of best known plays.