Willard Saulsbury Jr. (April 17, 1861 – February 20, 1927) was an American lawyer and politician from Wilmington, in New Castle County, Delaware. He was a member of the Democratic Party who served as U.S. Senator from Delaware and President Pro Tempore of the U.S. Senate.

Saulsbury was born in Georgetown, Delaware, son of Willard Saulsbury, Sr., and nephew of Gove Saulsbury and Eli Saulsbury. He married May Lammot du Pont, the granddaughter of Charles I. du Pont.^[1] He attended private schools and the University of Virginia at Charlottesville, where he was a member of St. Anthony Hall. Subsequently, he studied law, was admitted to the bar in 1882, and commenced practice in Wilmington, Delaware.

He was president of the New Castle Bar Association and chairman of the board of censors.

Saulsbury was a member of the Democratic National Committee from 1908 until 1920. He ran for U.S. Senator in 1899, 1901, 1903, 1905, 1907, and 1911, but Republicans controlled the state legislature and he was unsuccessful.

Democrats were in control of the legislature in 1913, the last time U.S. Senators were chosen by state legislators. Saulsbury was the preference of most Democrats and obtained the required majority after several days of balloting. During this term, he served with the Democratic majority in the 63rd, 64th, and 65th Congresses from March 4, 1913, until March 3, 1919. He was the President Pro Tempore of the Senate during the 64th and 65th Congresses. In the 63rd, 64th, and 65th Congresses he was Chairman of the Committee on Coast and Insular Survey, and in the 65th Congress he was also a member of the Committee on Pacific Islands and Puerto Rico.

By the time his term expired, the Seventeenth Amendment to the United States Constitution had been enshrined, so he had to face voters for the first time. In the election of 1918, he lost to Republican L. Heisler Ball, a former U.S. Senator. This loss has been attributed to his opposition to women's suffrage in the United States and his refusal to support the Nineteenth Amendment to the United States Constitution.^[2]

After leaving the Senate, he was a member of the advisory committee of the Conference on Limitation of Armaments in Washington, D.C., in 1921 and 1922, and a member of the Pan American Conference in Santiago, Chile, in 1923.

He continued the practice of law in Wilmington and Washington, D.C., until his death.

Saulsbury died in Wilmington and is buried in the Christ Episcopal Church Cemetery at Dover.^[3]