Bellanagare (Irish: Béal Átha na gCarr, meaning 'ford-mouth of the carts') or Ballinagare, is a village in County Roscommon, Ireland. The N5 national primary road passes through it as of 2008, though a by-pass is planned. The village is located between Tulsk and Frenchpark on the Dublin to Castlebar/Westport road.

Evidence of ancient settlement in the area includes several ringfort, enclosure, standing stone and Ogham stone sites in the townlands of Bellanagare, Drummin and Kilcorkey. Bellanagare Castle, located in Bellanagare townland and historically associated with the O'Conor family, was surrounded by a bawn wall and was the site of a later house.

The O'Conor Don ancestral lands were in County Roscommon centred on Clonalis House near Castlerea in County Roscommon. When Alexander O'Conor Don died in 1820 without a male heir, the title was inherited by the O'Conors of Bellanagare. In 1828, O'Conor Don of Belanagar was a member of the Grand Panel of County Roscommon. At the time of Griffith's Valuation (1860s), Charles Owen O'Conor was one of the principal lessors in the parishes of Kilcorkey and Kilkeevin, barony of Castlereagh.

Charles O'Conor, of Belanagare, was a scholar and antiquary who was born in 1710. In 1754 he published a work on Irish mining, and in 1766 he published the work for which he is best known, Dissertations on the History of Ireland. O'Conor died at Belanagare on 1 July 1791, and his collection of manuscripts (containing the only then known original of the first part of the Annals of the Four Masters), passed into the hands of the Marquis of Buckingham.

Hermitage House was built by Charles O'Conor circa 1760, and the former O'Conor family residence at Bellanagare Castle subsequently fell into ruin. Hermitage House, built some distance away, was a smaller Georgian house which O'Conor referred to as his "hermitage". At Hermitage House, he devoted his time to the collection and study of Irish manuscripts, the publication of dissertations, and the cause of Irish and Catholic emancipation. His great-great-grandson, also Charles O'Conor, was leasing the property at Ballaghcullia, valued at £10, to Honoria O'Conor at the time of Griffith's Valuation in 1868. As of the 21st century, Hermitage House is still extant though not occupied and a modern bungalow has been constructed in front of it.

Ballinagare Community Centre, a community-run centre for the village and surrounding area, runs leisure activities and has a gym, and astro turf pitch.

Ballinagare Football Club, an association football club which was established in 2004, plays its home games at Ballinagare Community Pitch beside the community centre. The club colours are orange with a black trim

Other sports clubs in the area include the Western Gaels GAA Club. This Gaelic Athletic Association club was formed in Fairymount Hall in 1962. The club's catchment area consists of the parishes of Frenchpark and Fairymount in West Roscommon, close to the towns of Castlerea and Ballaghaderreen. The club's crest includes images of several landmarks from the area, including Mount Druid House near Ballinagare.

Ballinagare Horse and Pony Racing club was established in 2012.

• Pádraig Ó Caoimh (1897–1964), soldier and secretary of the Gaelic Athletic Association
• Charles O'Conor (1710–1791), antiquarian and activist for Catholic Emancipation
• Douglas Hyde (1860–1949), the first President of Ireland, was from the area and attended fairs in Bellanagare

• List of towns and villages in Ireland

• Historic map showing Hermitage House and estate near Bellanagare
• Hermitage 1812 Bog Commission Survey - Photo