William Grant Stratton (February 26, 1914 – March 2, 2001), known as "Billy the Kid", was the 32nd Governor of Illinois from 1953 to 1961, succeeding Adlai Stevenson II in that office.

Stratton was born on February 26, 1914 in Ingleside, Lake County, Illinois.

He won the Republican nomination for Governor in 1952, then defeated Lt. Governor Sherwood Dixon to become the youngest governor in America at that time.

Stratton was re-elected Governor in 1956. In 1960 he ran for an unprecedented third consecutive term, but was defeated by Democrat Otto Kerner, Jr.

Stratton was acquitted on charges of tax evasion in 1965. In 1968, he ran in the Republican primary for Governor and was defeated by Richard B. Ogilvie.

Stratton died on March 2, 2001 from natural causes in Chicago, Illinois from natural causes, aged 87.