Letterfrack or Letterfrac (Irish: Leitir Fraic, meaning 'The Speckled Hill') is a small village in the Connemara area of County Galway, Ireland.

The village is south-east of Renvyle peninsula and 15 kilometres (9 miles) north-east of Clifden on Barnaderg Bay and lies at the head of Ballinakill harbour.

Like many other institutions run by the Christian Brothers, Letterfrack Industrial School has since become notorious for excessive use of corporal punishment, neglect, and child molestation of the boys in its charge, and was closed down in 1974.

[citation needed] The duplex operation was initially developed by Marconi's engineers at Letterfrack using a balanced Carborundum detector connected to a drop wire from an aerial suspended between Diamond Hill and Mweelin.

[citation needed] In 1924–26 a church was built on the ground of the Industrial School after the designs of the architect Rudolf Maximilian Butler in a Romanesque Revival style.