| William James Connell | |
| State: | Nebraska |
| Term Start: | March 4, 1889 |
| Term End: | March 4, 1891 |
| Predecessor: | John A. McShane |
| Successor: | William Jennings Bryan |
| Birth Name: | William James Connell |
| Resting Place: | Prospect Hill Cemetery, Omaha |
| Birth Date: | 6 July 1846 |
| Birth Place: | Cowansville, Quebec, Canada |
| Death Place: | Atlantic City, New Jersey |
| Party: | Republican |
William James Connell (July 6, 1846 – August 16, 1924) was an American Republican Party politician. From 1889 to 1891, he served one term in the U.S. House of Representatives.
Born in Cowansville, Quebec, he immigrated with his family to Schroon Lake, New York in 1857 and then moved to Vermont in 1862. He moved to Omaha, Nebraska in 1867 and studied law. He was admitted to the bar in 1869.
He was the district attorney of the third judicial district of Nebraska from 1872 to 1876 and a city attorney for the city of Omaha from 1883 to 1887.
He was elected to the Fifty-first United States Congress, serving from March 4, 1889, to March 3, 1891. He was an unsuccessful candidate for reelection in 1890, losing to William Jennings Bryan, the future Democratic nominee for President in 1896, 1900, and 1908, and future Secretary of State.
He returned to his job as Omaha's city attorney in 1892. He died in Atlantic City, New Jersey on August 16, 1924, and is buried in Prospect Hill Cemetery, Omaha.
His son, Dr. Karl Albert Connell, invented the gas mask used by American troops during World War I.