Bunnadober Mill is a watermill and National Monument located in County Mayo, Ireland.

The present mill was open by 1838 and was owned by William Walsh, before passing to the Morans c. 1900.

[2] The mill closed in 1980 was acquired by the state from the Moran family in 1996.

[3] It contains a unique example of a horizontal water wheel in Ireland, and has been described as "a testament to ingenuity and thrift far from an industrial centre."

"[4][5] The mill is a three-bay single-storey rectangular building with half-attic and was powered by the Bunnadober river, which has its source as an underground outflow of the Bulkaun River.