William Ladd (1778–1841) was an American anti-war activist.
William Ladd may also refer to:
- William E. Ladd (1880–1967), American surgeon
- William F. Ladd (1896–1980), American major general
- William Ladd Taylor (1854–1926), American illustrator
- William Palmer Ladd (1870–1941), American Episcopal priest and scholar
- William S. Ladd (1826–1893), American politician and businessman
This disambiguation page lists articles about people with the same name.
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