Arthur Stanley Williams (1861 in Brighton – 21 November 1938) was an English solicitor and amateur astronomer.
Using a 6½ inch reflector on an equatorial mount for most of his work, he published an influential paper in 1896: "On the Drift of Surface Material of Jupiter in Different Latitudes.
He championed the method of determining the longitude of surface features using their central meridian transit.
In 1899 he published his most influential paper: "Periodic Variations in the Colours of the two Equatorial Belts of Jupiter.
He was made a fellow of the Royal Astronomical Society in 1884, and was awarded the Jackson-Gwilt Medal in 1923.