James Aston, 5th Lord Aston of Forfar (23 May 1723 – 24 August 1751) was a son of Walter Aston, 4th Lord Aston of Forfar, and Lady Mary Howard.
On June 30, 1742, James married Lady Barbara Talbot, sister of the 14th Earl of Shrewsbury, by whom he had two daughters.
In 1748, he succeeded his father as Lord Aston of Forfar in the Peerage of Scotland.
Lord Aston produced no direct male heir by the time of his death in 1751, when his title passed to his distant cousin Philip Aston, 6th Lord Aston of Forfar.