The President of the Senate in the United States is the Vice President of the United States. The Vice President holds this title automatically under Article I, Section 3 of the U.S. Constitution and is the Senate’s presiding officer. The Vice President’s main role in the Senate is limited: they usually do not debate or vote on ordinary bills the way senators do. Their most important power is the ability to cast a tie‑breaking vote when the chamber is deadlocked 50–50 on a question. In other words, the President of the Senate may vote only when the Senate is equally divided , and that single vote decides the outcome of the matter before the Senate.

In practice, this means the Vice President often stays out of daily Senate proceedings and appears when a close vote is expected, especially on big nominations or controversial legislation where the parties are evenly split. When the Vice President is absent, a different officer (the president pro tempore or another senator designated to preside) chairs the session, but those officers do not gain an extra tie‑breaking vote; only the Vice President, as President of the Senate, has that specific constitutional power to break a tie.