William Clay
William Clay, Willie Clay, Bill Clay, or Billy Clay may refer to:
Politicians
- Bill Clay, politician from the state of Missouri
- Lacy Clay, politician from the state of Missouri
- Sir William Clay, 1st Baronet, English merchant and MP for Tower Hamlets
Sports
- William Clay (footballer), footballer
- Willie Clay, former American football player
- Billy Clay, American football cornerback
- William Clay (cyclist), American track cyclist
- Bill Clay (baseball), American baseball player
Others
- William Clay (industrialist), early user of the Bessemer process in Liverpool
- William Keatinge Clay, English cleric and antiquary