Daniel O'Brien, 3rd Viscount Clare was an Irish nobleman, the son of Connor O'Brien, 2nd Viscount Clare and Honora O'Brien. Clare was appointed commander of a newly raised regiment of foot, Clare's Regiment of Foot, an Irish regiment in the Dutch States Army, on 8 August 1674. He was replaced within twelve months by Sir John Fenwick. From July 1751 this regiment was known as the 5th Regiment of Foot. * Honora O'Brien * Daniel O'Brien, 4th Viscount Clare * Charles O'Brien, 5th Viscount Clare * v * t * e