Niall John O'Brien (born 8 November 1981) is a former Irish cricketer and a cricket commentator. He is a left-handed batsman and wicket-keeper. Domestically O'Brien began his professional career with Kent in 2004 before joining Northamptonshire at the start of 2007, spending six seasons there before joining Leicestershire for 2013. He made his One Day International debut for Ireland in 2006; two years later he played his first Twenty20 International. He was one of the eleven cricketers to play in Ireland's first ever Test match, against Pakistan, in May 2018.