William Riley may refer to:
- William J. Riley, United States federal judge
- William F. Riley, United States federal judge
- William Harrison Riley, British socialist
- William Bell Riley, American religious leader
- William Riley (criminal), a.k.a. "Mush" Riley, American saloon keeper and underworld figure
- Bill Riley, Canadian ice hockey player
- Bill Riley, Sr., American entertainer known as "Mr. State Fair" in Iowa
- Billy Riley, wrestler
- Billy Lee Riley, American musician
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Famous quotes containing the word riley:
“the ache here in the throat,
To know that I so ill deserve the place
Her arms make for me;”
—James Whitcomb Riley (1849–1916)