William Henry Foster (May 3, 1847 – 1886) was a British-born American labor union leader.
Active in the International Typographical Union (ITU), in 1878, he was elected as president of its local number 3.
In the role, he successfully introduced closed shops at the Enquirer, Sun, Gazette and Commercial, for which he gained the nickname of the "Original Boycotter".
This was held in November 1881, and established the Federation of Organized Trades and Labor Unions (FOTLU), with Foster as its founding secretary.
The following year, he was elected as president of the ITU local number 2, and became founding secretary of the city's Central Labor Union.