Shanmuckinish Castle, Medieval tower house in Drumcreehy, Ireland

Shanmuckinish Castle is a ruined four-storey tower house built of rubble stone around 1450. It stands almost to its original height of about 17 metres, with a partial collapse exposing the interior floors. Two vaulted ceilings, intramural passages and stairs, a bawn wall, a wall walk and two surviving machicolations remain.

Shanmuckinish was built in the 15th century, reportedly within three years of the other Muckinish castle, and was repaired around 1836. It was still habitable in 1897. Its similar name to Muckinish Nua has confused the chronology of ownership; it was also called Ballynacragga Castle, possibly after the MacNamara family's castle near Dromoland, from which they were expelled in 1654. The O'Loghlen, Neylon and Blake families inhabited both Muckinish castles up to the 19th century.

The Irish name Muck inis means 'pig island', and the townland is Muckinish West. For a time the tower house was also called Ballynacragga Castle, possibly because the MacNamara family brought the name of their castle near Dromoland after being expelled in 1654.

The building stands about 17 meters tall and can be viewed from the outside, though visitors should watch for uneven ground and missing railings. Wearing sturdy shoes is advisable given the rural location and condition of the site.

Two castles named Muckinish were built within three years of each other, with this one known as 'Shan' meaning old in Irish. The distinction between the two was a practical way for locals to tell them apart.