William Brabazon
William Brabazon may refer to:
- Sir William Brabazon (Leics MP 1313), MP for Leicestershire 1313 & MP for Northamptonshire 1343
- William Brabazon (Lord Justice of Ireland), government official in the Kingdom of Ireland
- William Brabazon, 1st Earl of Meath, Anglo-Irish peer
- Sir William Brabazon, 2nd Baronet, Anglo-Irish MP
- William Brabazon, 9th Earl of Meath, Anglo-Irish peer
- William Brabazon, 11th Earl of Meath, Irish peer