San Pietro Apostolo is a Roman Catholic parish church located on Piazza della Fortezza #7 in the upper town (Montecatini Alto) of Montecatini Terme, province of Pistoia, region of Tuscany, Italy.
The present church still retains some Romanesque elements from an original church, likely the chapel or church located inside a former castle, and dedicated to St Michael Archangel, a saint favored by Lombards. When the parish responsibilities of the rural church of San Pietro in Neure were transposed inside the medieval walls of the town and into this church, the rededication occurred. A major refurbishment took place in the 18th-century, when it was enlarged to have three aisles, under the designs of Antonio Zannoni. Some of the interior columns derive from the earlier Romanesque church.[1] Iin a survey of 1896, the interior of the church had altarpieces including a Concezione by Ranieri del Pace; a Resurrection and Saints by Santi di Tito; and two marble alatar by Marco Moretti. In the church museum is a Reliquary of Santa Barbara, attributed to Benvenuto Cellini or one of his followers.[2]