William James "Bill" O'Reilly, Jr. (born September 10, 1949) is an American television/radio host, author, and political commentator. He is the host of the cable news program The O'Reilly Factor. Prior to hosting The O'Reilly Factor, O'Reilly served as anchor of the entertainment program, Inside Edition. O'Reilly also hosts The Radio Factor, a radio program syndicated by Westwood One, and has written seven books.

William Joseph "Bill" O'Reilly, often known as Tiger O'Reilly, (born 20 December 1905 in White Cliffs, New South Wales; died 6 October 1992 in Sydney), was an Australian cricketer, rated as one of the greatest bowlers of all time. Following his retirement from playing, he became a well-respected cricket writer and broadcaster.

O'Reilly was one of the best spin bowlers ever to play cricket. He delivered the ball from a two-fingered grip at close to medium pace with great accuracy, and could produce leg breaks, googlies, and top spinners, with no discernible change in his action.

A tall man for his day (around 188 cm, 6 ft 2 in), he whirled his arms to an unusual extent and had a low point of delivery that meant it was very difficult for the batsman to read the flight of the ball out of his hand. According to Matthew Engel writing in Thirty Obituaries from Wisden, "When O'Reilly died, Sir Donald Bradman said he was the greatest bowler he had ever faced or watched." In 1935, Wisden wrote of him: "O'Reilly was one of the best examples in modern cricket of what could be described as a 'hostile' bowler." In 1939, Wisden reflected on Bill O'Reilly's successful 1938 Ashes tour of England: "He is emphatically one of the greatest bowlers of all time."

As a batsman, O'Reilly was a competent left-hander, usually batting well down the order. O'Reilly's citation as a Wisden Cricketer of the Year in 1935 said: "He had no pretensions to grace of style or any particular merit, but he could hit tremendously hard and was always a menace to tired bowlers."

As well as his skill, O'Reilly was also known for his competitiveness, and bowled with the aggression of a paceman. In a short biographical essay on O'Reilly for the Barclays World of Cricket book, his contemporary, the England cricketer Ian Peebles, wrote: "any scoring-stroke was greeted by a testy demand for the immediate return of the ball rather than a congratulatory word. Full well did he deserve his sobriquet of 'Tiger'."