William Williams was born in Leytonstone in June 1905. The family moved to East Ham and Williams attended the Central Park School. An extremely talented footballer he was selected to play for England Schoolboys after the First World War.
In 1917-1918 and 1918-1919 Williams was a member of the Central Park team that won the Robert Cook Cup, a competition for schools in Essex. The school team led by Williams also won the London Schools' Championship (Dewar Shield).
After leaving school Williams joined the Fairbairn House Boys' Club. Williams signed for West Ham United in 1921. At 15 he was the club's youngest ever full professional. On 6th May 1922, Syd King selected him to play against Blackpool at Bloomfield Road. The 16 year-old Williams scored but West Ham lost the game 3-1.
West Ham United won promotion to the First Division in the 1922-23 season. The first-team squad that year included Edward Hufton, Jack Young, Billy Henderson,