The College of William & Mary in Virginia (also known as The College, William & Mary, or W&M) is a public research university located in Williamsburg, Virginia, United States. Privately founded in 1693 by letters patent issued by King William III and Queen Mary II, it is the second-oldest institution of higher education in the United States after Harvard University.

William & Mary educated U.S. Presidents Thomas Jefferson, James Monroe, and John Tyler as well as other key figures important to the development of the nation, including U.S. Supreme Court Chief Justice John Marshall, Speaker of the House Henry Clay, and 16 signers of the Declaration of Independence. W&M founded the Phi Beta Kappa academic honor society in 1776 and was the first school of higher education in the United States to install an honor code of conduct for students. The establishment of graduate programs in law and medicine in 1779 make it one of the first universities in the United States.

In addition to its undergraduate program, the College is home to several graduate and professional schools, including law, business, public policy, education, marine science and colonial history. In 2012, W&M enrolled 6,071 undergraduate and 2,129 graduate and professional students.

The phrase William and Mary usually refers to the coregency over the Kingdoms of England, Scotland and Ireland, of first-cousins King William III & II and Queen Mary II. Their joint reign began in February 1689, when they were offered the throne by the Parliament of England, replacing James II & VII, Mary's father and William's uncle/father-in-law, who was "deemed to have fled" the country in the Glorious Revolution of 1688. After Mary died in 1694, William ruled alone until his death in 1702. William and Mary were childless and were ultimately succeeded by Mary's younger sister, Anne.

To end the Glorious Revolution, William and Mary signed the English Bill of Rights and began a new co-operation between the Parliament and the monarchs, leading to a greater measure of personal liberty and democracy in Britain. This action both signaled the end of several centuries of tension and conflict between the crown and parliament, and the end of the idea that England would be restored to Roman Catholicism, King William being a Protestant leader. The English Bill of Rights also inspired the English colonists in North America to revolt against the rule of James II and his proposed changes in colonial governance. These colonial revolts occurred in Massachusetts, New York, and Maryland.