• Bill O'Neill (baseball) (1880–1920), baseball player
• Bill O'Neill (bowler)
  Bill O'Neill (bowler)
  William "Bill" O'Neill is a right-handed professional ten-pin bowler who competes on the PBA Tour in North America. He is a resident of Southampton, Pennsylvania. His nickname on tour is "The Real Deal". O'Neill was the 2009-10 U.S. Open champion, winning the event on February 28, 2010...
  
   (born 1981), professional ten-pin bowler
• Bill O'Neill (media)
  Bill O'Neill (media)
  William Alan O'Neill is the Australian-American former media executive who, in a 50-year career, held multiple positions within News Corporation, including two separate terms as head of News International, a Director on the company's main board, and Executive Vice President of News Corporation...
  
   (born 1936), News Corporation executive
• Billy O'Neill
  Billy O'Neill
  William "Billy" O'Neill often recorded as Billy O'Neil or Billy Neil was a Welsh international dual-code rugby front row player who played club rugby under the union code for Cardiff and Aberavon and as a professional rugby league player he represented Warrington...
  
   (1878–1955), Welsh rugby player
• Buckey O'Neill (1860–1898), Old West sheriff and U.S. Army officer killed at the Battle of San Juan Hill
• C. William O'Neill
  C. William O'Neill
  C. William O'Neill was a Republican politician from Ohio. He was born in Marietta, Ohio. He was the 59th Governor of Ohio. He graduated from both Marietta College and The Ohio State University Moritz College of Law...
  
   (1916–1978), Governor of Ohio
• William O'Neil
  William O'Neil
  William J. O'Neil is an American entrepreneur, stockbroker and writer, who founded the business newspaper Investor's Business Daily and the stock brokerage firm William O'Neil + Co. Inc...
  
   (born 1933), entrepreneur and stockbroker who founded the newspaper Investor's Business Daily
• William O'Neill, 1st Baron O'Neill
  William O'Neill, 1st Baron O'Neill
  Reverend William O'Neill, 1st Baron O'Neill , born William Chichester, he changed his surname to O'Neill in 1855; O'Neill was an Anglo-Irish hereditary peer, clergyman and musical composer.-Background and education:...
  
   (1813–1883), Anglo-Irish hereditary peer, clergyman and musical composer
• William O'Neill (Connecticut politician)
  William O'Neill (Connecticut politician)
  William Atchison O'Neill was a twentieth century U.S. political figure, most notably as the 84th Governor of Connecticut from 1980 to 1991....
  
   (1930–2007), Governor of Connecticut in the 1980s and early 1990s
• William O'Neill (Medal of Honor)
  William O'Neill (Medal of Honor)
  William O'Neill was an American soldier in the U.S. Army who served with the 4th U.S. Cavalry during the Indian Wars. He was one of several men who received the Medal of Honor for gallantry while fighting the Comanche at Red River, Texas on September 29, 1872.-Biography:William O'Neill was born in...
  
   (1848–?), American soldier in the Indian Wars
• William O'Neill (Ohio jurist)
  William O'Neill (Ohio jurist)
  William "Bill" Michael O'Neill is an American lawyer, jurist and political figure who was an appellate judge on the Ohio Eleventh District Court of Appeals. He was the 2010 Democratic nominee for U.S...
  
   (born 1947), appellate judge and 2008 candidate for U.S. Representative from Ohio's 14th congressional district
• Willie O'Neill
  Willie O'Neill
  William "Willie" O'Neill was a Scottish football player who played for Celtic and Carlisle United as a full-back....
  
   (1940–2011), Scottish footballer (Celtic FC)
• Willie O'Neill (1900s hurler), see List of All-Ireland Senior Hurling Championship medal winners
• Willie O'Neill (1960s hurler), see Gerald McCarthy (hurler)
• Willie O'Neill (Irish footballer), see 1938 FIFA World Cup qualification (UEFA – Group 2/Group 3/Group 5)

See also

• Bill O'Neal
  Bill O'Neal
  John William O'Neal, known as Bill O'Neal , is an American author who has written some thirty books and more than three hundred articles and book reviews on the American West, including gunfighters, lawmen, and ghost towns; Country music, with emphasis on Texas artists; baseball, such as his study...
  
   (born 1942), American historian
• Bill O'Neil, former member of the Ohio House of Representatives
• Billy O'Neil
  Billy O'Neil
  = 279 Billy O'Neil was a fictional footballer on Sky One's television drama Dream Team. He was a striker for Harchester United....
  
  , fictional footballer in Dream Team