William Adlington Cadbury (17 February 1867 – 8 July 1957) was an English businessman affiliated with his family company, Cadbury.
He was born in Edgbaston and educated at Quaker schools. He began working at Cadbury in 1887.
In 1905 he commissioned the first Cadbury logo. In 1921, the Cadbury script logo was introduced, based on William Cadbury's signature.
He married Geraldine Southall (later Dame Geraldine Cadbury) on 8 September 1891, at the Friends' meeting house in Birmingham. Their children were Dorothy Adlington (1892–1987), Paul Strangman (1895–1984), and Geraldine Mary Cadbury (1900–1999).
He died at Bromsgrove, Worcestershire, aged 90.