- Source: Nicholas Arnold (MP for Monmouthshire)
Nicholas Arnold (c. 1600 – 1665) was a Welsh gentleman landowner who sat in the House of Commons between 1626 and 1629.
Arnold was the son of John Arnold of Llanthony. He matriculated at St Alban Hall, Oxford, on 29 November 1616 aged sixteen.
In 1626, Arnold was elected Member of Parliament for Monmouthshire. He was re-elected as member for Monmouthshire in 1628 and held his seat until 1629, when King Charles decided to rule without parliament for eleven years. He was High Sheriff of Monmouthshire in 1633.
Arnold married Margaret Evan, daughter of John Evan of Dorset.