J Street (Hebrew: ג'יי סטריט) is a nonprofit liberal Zionist advocacy and lobby group based in the United States whose aims include strengthening Jewish democracy in Israel, promoting a diplomatic end to the Israeli–Palestinian conflict with a two-state solution, and opposing the Boycott, Divestment and Sanctions movement.

J Street describes itself as "the political home for pro-Israel, pro-peace Americans who want Israel to be secure, democratic and the national home of the Jewish people". Many right-wing and Zionist critics allege that J Street and the policies they support are anti-Israel. Left-wing and anti-Zionist critics reject J Street's positions in favor of Zionism and aid to Israel, its rejection of Boycott, Divestment and Sanctions and human rights organizations' allegations of a Gaza genocide, and past efforts against Palestinian statehood.

J Street, as an American lobby organization aimed at Washington leaders and policymakers, derived its name from the alphabetically named street plan of Washington, D.C.: J Street is missing from the grid (the street naming jumps from I Street to K Street since I and J were not yet considered to be distinct letters at the time the Washington street plan was created). Also, by association, the letter J is a reference to "Jewish". Further, K Street is a street in downtown Washington on which many influential lobbying firms are located, and that become synonymous for Washington's formidable lobbying establishment. Consequently, the choice of the name reflects the desire of J Street's founders and donors to bring a message to Washington that, metaphorically like the missing "J Street" of the D.C. grid, has thus far been absent.

J Street's stated aim is to provide a political home for pro-Israel, pro-peace Americans who believe that a "two-state solution to the Israeli-Palestinian conflict is essential to Israel's survival as the national home of the Jewish people and as a vibrant democracy". J Street strongly opposes Boycott, Divestment and Sanctions.

According to its executive director, Jeremy Ben-Ami, J Street is proud of AIPAC's accomplishments, but the two groups have different priorities rather than different views. Explaining the need for a new lobbying group, Ben-Ami stated: "Israel's interests will be best served when the United States makes it a major foreign policy priority to help Israel achieve a real and lasting peace...." Alan Solomont, one of the founders of J Street and a former national finance chair of the Democratic National Committee (DNC), described the need for J Street in the following way:"We have heard the voices of neocons, and right-of-center Jewish leaders and Christian evangelicals, and the mainstream views of the American Jewish community have not been heard." During its first conference, Ben-Ami said, "The party and the viewpoint that we're closest to in Israeli politics is actually Kadima." According to Peter Frey, a financier and chairman of J Street's board, "J Street is a Zionist organization, It's 'pro-Israel, pro-peace' — it starts with 'pro-Israel.'"

The Washington Post described the perceived differences between J Street and AIPAC: "While both groups call themselves bipartisan, AIPAC has won support from an overwhelming majority of Republican Jews, while J Street is presenting itself as an alternative for Democrats who have grown uncomfortable with both Netanyahu's policies and the conservatives' flocking to AIPAC."

In 2011, J Street opposed recognizing Palestine as an independent state at the United Nations. J Street endorsed the nuclear disarmament deal with Iran, which Obama supported and Netanyahu and AIPAC opposed. In 2016 the political focus of J Street was to unseat Republican senators who led U.S. Congressional opposition to the Iran deal.

J Street and J Street PAC, founded in April 2008, exist as separate legal entities with different political functions. The J Street Education Fund joined the J Street family of organizations in 2009: