Delia Rigal is the stage name of Delia Dominga Mastrarrigo (October 6, 1920 – May 8, 2013), an Argentine soprano who performed at the Teatro Colón in Buenos Aires in the period 1943 to 1955, La Scala in Milan and the Metropolitan Opera in New York, where she sang for seven consecutive seasons, beginning with Rudolf Bing's debut as director in 1950.

The following year she was part of the second cast of La Traviata and Simon Boccanegra and in 1944 she created the Empress Augusta in Héctor Panizza's opera Byzantium, who also premiered Aurora in 1945.

Between 1945 and 1955 it was Armida, Rezia, Manon Lescaut, Iphigénie in Tauride, Aida, Leonora, Alcestes, Countess Almaviva, Thais, Tosca, Maddalena and Fiora.

In that house (and on tours with the company) she sang more than 100 performances such as Nedda, Tosca, Aida, Donna Elvira, Condesa Almaviva , Violetta and Leonora.

She emigrated for political reasons in 1955, after being displaced from the Colón Theater in September of that year, settling in Long Island, United States.