John William Davis (April 13, 1873 – March 24, 1955) was an American politician, diplomat and lawyer. He served as a United States Representative from West Virginia (1911–1913), then as Solicitor General of the United States and US Ambassador to the UK under President Woodrow Wilson. Over a 60-year legal career, he argued 140 cases before the US Supreme Court.

Davis is best known as the Democratic Party nominee for President of the United States during the 1924 presidential election, losing to Republican incumbent Calvin Coolidge.

Davis's great-grandfather, Caleb Davis, was a clockmaker in the Shenandoah Valley. In 1816, his grandfather, John Davis, moved to Clarksburg in what would later become West Virginia, which had a population of 600–700 at the time, and ran a saddle and harness business. His father, John James Davis, attended Lexington Law School, which later became the Washington and Lee University School of Law, and by the age of twenty, had established a law practice in Clarksburg. John J. Davis was a delegate in the Virginia General Assembly, and after the northwestern portion of Virginia broke away from the rest of Virginia in 1863 and formed West Virginia, he was elected to the new state's House of Delegates and later to the United States House of Representatives.