Ignazio Busca (31 August 1731 in Milan – 12 August 1803 in Rome) was an Italian cardinal and Secretary of State of the Holy See. He was the last son of Lodovico Busca, marquess of Lomagna and Bianca Arconati Visconti. he took a degree in utroque iure in 1759 at the Università La Sapienza of Rome.
Ignazio Busca (31 August 1731 in Milan – 12 August 1803 in Rome) was an Italian cardinal and Secretary of State of the Holy See. He was the last son of Lodovico Busca, marquess of Lomagna and Bianca Arconati Visconti. he received a degree in utroque iure in 1759 at the Università La Sapienza of Rome.