The vice president of the United States (VPOTUS) is the second-highest officer in the executive branch of the U.S. federal government, after the president of the United States, and ranks first in the presidential line of succession. The vice president is also an officer in the legislative branch, as the president of the Senate. In this capacity, the vice president is empowered to preside over Senate deliberations at any time, but may not vote except to cast a tie-breaking vote. The vice president is indirectly elected together with the president to a four-year term of office by the people of the United States through the Electoral College.The modern vice presidency is a position of significant power and is widely seen as an integral part of a president's administration. While the exact nature of the role varies in each administration, most modern vice presidents serve as a key presidential advisor, governing partner, and representative of the president. The vice president is also a statutory member of the National Security Council and thus plays a significant role in national security matters. As the vice president's role within the executive branch has expanded, the legislative branch role has contracted; for example, vice presidents now preside over the Senate only infrequently.The role of the vice presidency has changed dramatically since the office was created during the 1787 Constitutional Convention. Originally something of an afterthought, the vice presidency was considered an insignificant office for much of the nation's history, especially after the Twelfth Amendment meant that vice presidents were no longer the runners-up in the presidential election. The vice president's role began steadily growing in importance during the 1930s, with the Office of the Vice President being created in the executive branch in 1939, and has since grown much further. Due to its increase in power and prestige, the vice presidency is now often considered to be a stepping stone to the presidency. Since the 1970s, the vice president has been afforded an official residence at Number One Observatory Circle.

The Constitution does not expressly assign the vice presidency to a branch of the government, causing a dispute among scholars about which branch the office belongs to (the executive, the legislative, both, or neither). The modern view of the vice president as an officer of the executive branchone isolated almost totally from the legislative branchis due in large part to the assignment of executive authority to the vice president by either the president or Congress. Nevertheless, modern vice presidents have often previously served in Congress, and are often tasked with helping to advance an administration's legislative priorities.

Kamala Harris is the 49th and current vice president of the United States. She is the first African American, first Asian American, and first female occupant of the office. She assumed office on January 20, 2021.

Nelson Aldrich Rockefeller (July 8, 1908 – January 26, 1979), sometimes referred to by his nickname, Rocky, was an American businessman and politician who served as the 41st vice president of the United States from December 1974 to January 1977, and previously as the 49th governor of New York from 1959 to 1973. He also served as assistant secretary of State for American Republic Affairs for Presidents Franklin D. Roosevelt and Harry S. Truman (1944–1945) as well as under secretary of Health, Education and Welfare under Dwight D. Eisenhower from 1953 to 1954. A grandson of Standard Oil founder John D. Rockefeller and a member of the wealthy Rockefeller family, he was a noted art collector and served as administrator of Rockefeller Center in Manhattan, New York City.

Rockefeller was a Republican who was often considered to be liberal, progressive, or moderate. In an agreement that was termed the Treaty of Fifth Avenue, Rockefeller persuaded Richard Nixon to alter the Republican Party platform just before the 1960 Republican Convention. In his time, liberals in the Republican Party were called "Rockefeller Republicans". As Governor of New York from 1959 to 1973, Rockefeller's achievements included the expansion of the State University of New York, efforts to protect the environment, the construction of the Governor Nelson A. Rockefeller Empire State Plaza in Albany, increased facilities and personnel for medical care, and the creation of the New York State Council on the Arts.

After unsuccessfully seeking the Republican presidential nomination in 1960, 1964, and 1968, Rockefeller was appointed vice president of the United States under President Gerald Ford, who ascended to the presidency following the August 1974 resignation of Richard Nixon. Rockefeller was the second vice president appointed to the position under the 25th Amendment, following Ford himself. Rockefeller declined to be placed on the 1976 Republican ticket with Ford. He retired from politics in 1977 and died two years later.

As a businessman, Rockefeller was president and later chair of Rockefeller Center, Inc., and he formed the International Basic Economy Corporation in 1947. Rockefeller assembled a significant art collection and promoted public access to the arts. He served as trustee, treasurer, and president of the Museum of Modern Art, and founded the Museum of Primitive Art in 1954. In the area of philanthropy, he founded the Rockefeller Brothers Fund in 1940 with his four brothers and established the American International Association for Economic and Social Development in 1946.