San Michele di Plaiano, Former rural Romanesque church in Sassari, Italy

San Michele di Plaiano is a rural church in the countryside of Sassari, about 8–9 km northwest of the city along the SP 60 Buddi Buddi road. Its tan stone facade has a gabled roofline, an upper arched opening with two vertical slits flanked by arcades, and three blind arches below, each with a circular medallion. Inside, a long hall of three square modules leads to an altar under a pitched roof with dark wooden beams.

In 1082 Judge Mariano I of Torres gave the fertile lands of Plaiano to the Opera di Santa Maria di Pisa; in 1115-1116 they passed to the monastery of San Zeno. On 3 September 1127 the church, with its lands, vines and four dependent churches, went from the Camaldolese to the Vallombrosans, who stayed until the 15th century. Pope Innocent II exempted it from episcopal jurisdiction on 24 May 1139; in 1585 its revenues went to the Spanish Inquisition, and in 1769 to the hospital of Sassari.

The church is also called Santu Miali de Li Piani in Sassarese, the local dialect. From 1127 it belonged to the Vallombrosan monks, and the bishop of Ampurias still holds the honorary title of abate di San Michele di Plaiano. The statue of Archangel Michael once kept here has been lost since the complex passed to private owners.

The church stands about 8–9 km northwest of Sassari along the SP 60, known as Buddi Buddi. It is screened by the road embankment and only comes into view when travelling toward the city, so approach from that direction. The interior is a single aisle with plain wooden chairs facing the altar.

The bishop of Ampurias still holds the purely honorary title of "abbot of San Michele di Plaiano", a right dating back to a papal bull of 8 December 1503. The wooden statue of Saint Michael the Archangel once kept here disappeared after the complex passed into private hands.