Bill or William Tobin may refer to:

• Bill Tobin (baseball) (1854–1912), baseball player
• Bill Tobin (American football) (1941–2024), American football player
• Bill Tobin (ice hockey) (1895–1963), Canadian ice hockey player, executive and head coach
• William Tobin (journalist) (1927–2009), American journalist
• William Tobin (cricketer) (1859–1904), Australian cricketer
• William Tobin (astronomer) (1953–2022), British–New Zealand astronomer and academic
• William J. Tobin, American entrepreneur and inventor
• Liam Tobin (1895–1963), Irish intelligence officer and mutineer