William Younger may refer to:

• William Younger (brewery), an Edinburgh-based brewery that was part of Scottish Brewers, later Scottish & Newcastle, now a brand of Wells & Young
  • William Younger I, whose son Archibald Campbell Younger named the eponymous brewery for him
• Sir William Younger, 1st Baronet, of Auchen Castle (1862–1937), Scottish politician
• William L. Younger (1894–1977), American football player, coach, and college athletics administrator
• William McEwan Younger (1905–1992), Scottish brewer and political activist