Kilrush Church, Medieval church ruin in Limerick, Ireland

Kilrush Church is a rectangular stone ruin on the north bank of the River Shannon, 2 km west of Limerick city centre. Its large stone blocks and lintel place it in the pre-Norman period, and a 15th-century window from a nearby Franciscan church is set into the south wall.

Kilrush Church was probably built in the 10th century and first appears in written records in 1201; it is considered the oldest building in Limerick. Its large stone blocks and lintel place the structure in the pre-Norman period. The south wall holds a 15th-century window brought from a nearby Franciscan church.

The dedication to Mainchín mac Setnai, a saint of the late 6th century, gave the church its second name, St. Munchin's. The south wall holds a 15th-century window moved here from a nearby Franciscan church, known as the Quinlivan window. About 40 burials were found beneath that window during the 1999 excavation.

The ruin stands about 2 km west of Limerick city centre, on the north bank of the River Shannon. The rectangular structure survives as masonry walls with a large stone lintel; the 15th-century window in the south wall is the feature to look for. The ground beneath the Quinlivan window was excavated in 1999, so the interior should be treated as an archaeological area.

The south wall's window is 15th-century work brought from a nearby Franciscan church, so it is not part of the original build. The 1999 excavation found about 40 burials beneath it, dated to the 16th or 17th century.