William P. O’Neill (7 February 1874 – 1955) was a politician from the U.S. state of Indiana.
William O’Neill was born in South Bend, St. Joseph County in Indiana.
[1] He joined the Democratic Party and in 1912 he was elected to the office of the Lieutenant Governor of Indiana.
In this function he was the deputy of Governor Samuel M. Ralston and he presided over the Indiana Senate.
William O’Neill died in 1955 in Mishawaka, St. Joseph County, in Indiana.