- William Scheller
- William Scheuerer
- William Scheuerer
- William Schleicher
- William Schwab
- William Scott Ortwein
- William Seabaugh
- William Sentell
- William Seybold
- William Shaheen
- William Sharpe
- William Sherman
- William Shields
- William Shiry
- William Simmons
- William Simpson
- William Skinner
- William Slattery
- William Slover
- William Smales
- William Smith
- William Smith
- William Snow
- William Snyder
- William Sondericker
- William Sopp
- William Sorin
- William Spell
- William Stewart
- William Strench
- William Strong
- William Sullivan
- William Surman
- William Susman
- William Sutherland
- William Sweedler
- William Teten
- William Thierbach
- William Thomas
- William Thomas Watts Jr.
