The Pontifical Basilica of St. Michael (Spanish: Basílica Pontificia de San Miguel) is a Baroque-style Catholic church and minor basilica in central Madrid, Spain. It is located in San Justo Street, adjacent to the Archbishop's Palace. It is the church of the Apostolic Nunciature to the Kingdom of Spain of the Holy See and is now administered by the priests of Opus Dei.

Construction began in 1739, on the site of the parish church of Sts. Justus and Pastor. The work was commissioned by Cardinal Infante Luis of Chinchón, Archbishop of Toledo, who subsidized construction with 1,421,000 reales. Construction was completed in 1745.

After the Napoleonic invasion, the church added the advocacy of Saint Michael (San Miguel), when the nearby parish church of San Miguel de los Octoes was torn down.

The original plans have been attributed to Santiago Bonavía, with perhaps an earlier contribution of Teodoro Ardemans. It was completed by Vigilio Rabaglio to Gandria. On the facade, the allegorical statues of charity, faith, hope, and fortitude were sculpted by Roberto Michel and Nicolás Caresana. A panel by Caresana, on the facade depicts the martyrdom of Santos Justo y Pastor. The cupola is decorated with frescos (1745), by Bartolomé Rusca, depicting the apotheosis of Santos Justo y Pastor.

Among the wood sculptures housed in the interior is the "Cristo de la Fe y del Perdón", by Luis Salvador Carmona.

The Italian composer Luigi Boccherini, who died in Madrid, was buried here until 1927, when Benito Mussolini repatriated the remains to the church of San Francesco in his native town Lucca.

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  Interior of the basilica.
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  Towers above Archbishop's Palace.

• Catholic Church in Spain
• List of oldest church buildings

• Official website of the Pontifical Basilica of St. Michael