Walter Aston, 3rd Lord Aston of Forfar (1633 – 20 November 1714) was the eldest son of Walter Aston, 2nd Lord Aston of Forfar, and his wife Lady Mary Weston, daughter of Richard Weston, 1st Earl of Portland. He is best remembered today as a fortunate survivor of the Popish Plot.
He succeeded his father as Lord Aston of Forfar in the peerage of Scotland in 1678; he resided mainly at Tixall in Staffordshire. He also owned an estate at Standon in Hertfordshire, which came to the Aston family by inheritance from their Sadler relatives.