William John Foster was a politician and Supreme Court judge in colonial New South Wales, Attorney General from 1877 to 1878.
- Occupation
- politician, barrister, Crown Prosecutor
- Position held
- Member of the New South Wales Legislative Council, Member of the New South Wales Legislative Assembly, Member of the New South Wales Legislative Assembly, Attorney General of New South Wales
- Born
- January 13, 1831
- Died
- August 16, 1909, May 25, 1902