Curraunboy (Irish: An Corrán Buí; also known as Cornboy, meaning "yellow crescent") is a Gaeltacht village and townland in northwest County Mayo, Ireland. It is situated in the barony of Erris and civil parish of Kilcommon. Curraunboy townland has an area of approximately 2844 acres (11.51 km²) and, as of 2011, had a population of 76 people.

Remains of potential Iron Age settlement is recorded in an area known as the Sandhills. The sand buried the huts again until they were revealed by another storm in 1903. This settlement, northwest of the pier included numerous buildings and middens containing periwinkle and cockles.

Fr. Sean Noone in Where The Sun Sets notes that William Bald's 1812 map shows a small group of eight houses, originally, the residents here lived closer to the Cornboy pier at Broadhaven Bay, close to an old church on a hill, but were forced to relocate due to sands that were starting to cover the settlement. Cornboy Pier was erected in 1887.

A storm in 1911 blew away the roof of the old church and severely damaged its walls. The 1920 Ordnance Survey refers to a settlement approximately 200 yards inland from the old Cornboy pier. Thomas Johnson Westropp, who investigated this site around 1912, reported that locals claimed it had been uncovered by a storm, likely the 1839 Night of the Big Wind.

The Gweedaney River that originates in Portacloy flows through the townland. The townland consists of an area of dunes, farms and mountain bog.

The Catholic Church of Our Lady, Star of the Sea built between 1912 and 1913 and dedicated in 1914, is the local parish church. Elements include pitched slate roofs, round-headed doors and windows with stained glass, and a bell-cot.

The interior has a central aisle, timber pews, and an alabaster altar. The church retains much of its original design and fabric, and has been described as an example of early 20th-century Romanesque architecture.

There is a 9 km walk, the "Cornboy Loop" that passes through the townland. There is a community centre and cemetery in the village.

• List of towns and villages in County Mayo
• Townlands of Kilcommon