Santa Maria di Collemaggio is a church located in L'Aquila, a city in the Abruzzo region of Italy. The church was built in the 13th century by Pietro da Morrone, a hermit who later became Pope Celestine V. The church was constructed as a pilgrimage site and a center for Franciscan spirituality.

The church is known for its striking rose window, which is considered to be one of the finest examples of Gothic architecture in Italy. The facade of the church features intricate carvings and frescoes, while the interior is adorned with colorful murals and sculptures. The church also houses the tomb of Pope Celestine V, which is adorned with precious stones and metals.

Santa Maria di Collemaggio is one of the most important landmarks of L'Aquila and is visited by thousands of pilgrims each year. The church is also the site of several important religious and cultural events, including the Festival of St. Celestine, which takes place every year on May 19th.