William James Percival Webber (11 September 1901 – 12 April 1982) was a Welsh trade unionist.
He also joined the Railway Clerks' Association (RCA), and became active in the Labour Party.
[1] In 1932, Webber was elected to Swansea Borough Council, and was the deputy mayor in 1942/43.
From 1940, he was chairman of the National Joint Council for Local Authorities Clerical, Administrative, Professional and Technical Grades.
That year, he was elected as general secretary of the renamed Transport Salaried Staffs' Association (TSSA), and also to the General Council of the Trades Union Congress (TUC).