William Henry Wills, 1st Baron Winterstoke, known as Sir William Wills, Bt., between 1893 and 1906, was a British businessman, philanthropist and Liberal politician.

William Day Wills of 2 Portland Square, Bristol, England, was a tobacco merchant who in 1830 together with his younger brother Henry Overton Wills II took over W.D. & H.O. Wills, a company which by the late 1800s had become Britain's largest importer of tobacco and manufacturer of tobacco products.