William Hay
- Bill Hay
- Bill Hay (field hockey)
- Bill Hay (footballer)
- Bill Hay (radio announcer)
- Rupert Hay
- Will Hay
- William Delisle Hay
- William H. Hay
- William Hay (Australian politician)
- William Hay (English cricketer)
- William Hay (New Zealand cricketer)
- William Hay (Seaford MP)
- William Hay (architect)
- William Hay (author)
- William Hay (bishop)
- William Hay (died 1664)
- William Hay (police commissioner)
- William Hay Macnaghten
- William Hay, 10th Earl of Erroll
- William Hay, 10th Marquess of Tweeddale
- William Hay, 11th Marquess of Tweeddale
- William Hay, 15th Earl of Kinnoull
- William Hay, 17th Earl of Erroll
- William Hay, 18th Earl of Erroll
- William Hay, 1st Earl of Erroll
- William Hay, 3rd Earl of Erroll
- William Hay, 4th Earl of Erroll
- William Hay, 4th Earl of Kinnoull
- William Hay, 5th Earl of Erroll
- William Hay, 6th Earl of Erroll
- William Hay, 6th Earl of Kinnoull
- William Hay, Baron Hay of Ballyore
- William Haye
- William Hayes (disambiguation)
- William Hays (disambiguation)
- William Howard Hay
- William Perry Hay
- William Robert Hay
- William W. Hay