Rowland Ponsonby Blennerhassett

Rowland Ponsonby Blennerhassett KC, JP (22 July 1850 – 7 April 1913) was an Irish politician.

He was the only son of Richard Francis Blennerhassett and his wife Honoria Ponsonby, daughter of William Carrique Ponsonby. Blennerhassett was educated at Trinity College, Dublin and at Christ Church, Oxford. In a by-election in 1872, he entered the British House of Commons and sat as Member of Parliament (MP) for Kerry until 1885. Blennerhassett was called to the bar by the Inner Temple in 1878, and in April 1894 became bencher and a King's Counsel. He was a Justice of the Peace for Kerry.

On 21 September 1876, he married Mary Beatrice Armstrong, youngest daughter of Walter Armstrong. They had one son.