Barnaderg (Irish: Bearna Dhearg, meaning "red gap") is a village northeast of Tuam in eastern County Galway, Ireland.
Barnaderg Castle was a 16th-century stronghold of the O'Kelly clan.
In June 2008, a new €1.5m extension was opened at Barnaderg National School, which has 87 pupils. The extension provides a new classroom, a general purpose room, a library, a learning support room, a resource room, a staff room and an office and store rooms. Refurbishment of the existing building and extensive on site works were also carried out.
Coordinates: 53°29′N 8°43′W / 53.483°N 8.717°W