Monastero di San Pietro in Lamosa, Medieval monastery in Provaglio d'Iseo, Italy.

Monastero di San Pietro in Lamosa is a medieval monastery in Provaglio d'Iseo with a church featuring three naves, four bays, and three apses along with a bell tower and cloister on the southern side. The complex also includes spaces for cultural events and an auditorium.

A private church of the feudal de Ticengo family stood here before 1083, when Ambrogio and Oprando de Ticengo donated it to the Cluniac order. A 1095 bull of Urban II confirmed San Pietro in Lamosa as an autonomous priory with the churches of Trigolo and Alfianello as dependencies. In 1144 the abbot Ponzio ceded the church of S. Gervasio in Clusane to the pieve of Sant'Andrea di Iseo for an annual payment to Cluny.

The interior walls display fresco collections spanning the 12th to 16th centuries, including the Historia Salutis cycle in the Santa Maria Maddalena oratory. These artworks show the religious devotion and artistic skill that were cultivated within the monastery over several centuries.

The church was donated to the parish of Provaglio in 1983, while the rest of the complex remains private; only the former Disciplina rooms and a few small spaces are managed by the Fondazione culturale San Pietro in Lamosa, which restored them and runs cultural activities there. Visitors should therefore expect limited access, concentrated on those entrusted spaces and the church.

A relief of the young Attis, cross-legged and wearing a Phrygian cap, was found set into the wall of the loggia of the Casa Bergomi attached to the church. Gabriele Rosa took it for Mithras, but the figure is now identified as Attis, evidence of cults tied to death and rebirth in the Po plain.