Charles Ellis Schumer is an American politician serving as Senate Majority Leader since 2021 and the senior United States senator from New York since 1999. A member of the Democratic Party, he has led the Senate Democratic Caucus since 2017 and was Senate Minority Leader from 2017 to 2021. Schumer is in his fifth Senate term, making him the longest-serving US senator from New York, having surpassed Daniel Patrick Moynihan and Jacob K. Javits in 2023. He is the dean of New York's congressional delegation.

The Democratic Caucus of the United States Senate, sometimes referred to as the Democratic Conference, is the formal organization of all senators who are part of the Democratic Party in the United States Senate. For the makeup of the 118th Congress, the caucus additionally includes three independent senators who caucus with the Democrats, bringing the current total to 51 members. The central organizational front for Democrats in the Senate, its primary function is communicating the party's message to all of its members under a single banner. The present chair of the Senate Democratic Caucus is Chuck Schumer of New York.