Marc'Antonio Pasqualini (c. 1626–after 1684) was an influential Italian composer and singer active during the Baroque period. Primarily recognized for his contributions to opera and sacred music, he was known for his virtuosic vocal style and the expressive qualities of his compositions. Pasqualini's notable works include several operas, such as "La Fede nei Tradimenti," which showcased his ability to blend dramatic narrative with musical innovation. He also composed a variety of cantatas and arias, which were celebrated for their lyrical beauty and technical demands on performers. His impact on music is particularly evident in the way he influenced the development of the Italian opera genre, contributing to the evolution of vocal writing that would shape future composers. His works often featured intricate ornamentation and emotive melodies, which became hallmarks of Baroque music. Pasqualini's legacy is reflected in the continued study and performance of his music, as well as in the appreciation of his role in the transition of operatic styles during the 17th century.