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William Stephen Jacob (1813-1862) was an English immigrant astronomer who served as the director of the Madras Observatory in India from 1848 to 1859. During his tenure at the Madras Observatory, Jacob conducted various astronomical observations and experiments. He compiled a catalog of 244 double stars observed at Pune with a 5-foot equatorial. He also made observations of the Saturnian and Jovian systems and computed orbits for several binary star systems. He participated in the official expedition to Spain to observe a solar eclipse in 1860. He made accurate measurements of saturns rings and satellites of Jupiter. He was elected a fellow of the Royal Astronomical Society in 1849. Unfortunately, his life was short, and he died in Pune in August 1862 at the age of 48.