Black power is a political slogan and a name which is given to various associated ideologies which aim to achieve self-determination for black people. It is primarily, but not exclusively, used in the United States by black activists and other proponents of what the slogan entails. The black power movement was prominent in the late 1960s and early 1970s, emphasizing racial pride and the creation of black political and cultural institutions to nurture, promote and advance what was seen by proponents of the movement as being the collective interests and values of black Americans.

The basis of black power is various ideologies that aim at achieving self-determination for black people in the U.S., dictating that black Americans create their own identities despite being subjected to pre-existing societal factors. "Black power" in its original political sense expresses a range of political goals, from militant self-defense against racial oppression to the establishment of social institutions and a self-sufficient economy, including black-owned bookstores, cooperatives, farms, and media. However, the movement has been criticized for alienating itself from the mainstream civil rights movement, and its support of black separatism.

The earliest known usage of the term "black power" is found in Richard Wright's 1954 book Black Power. On May 1, 1965, a few months after the February 21 assassination of Malcolm X, Grace Lee Boggs and James Boggs created "in our basement" the national Organization for Black Power, along "with former and then current members of the Revolutionary Action Movement (RAM) and SNCC among its members," including "representatives from Washington, D.C., Philadelphia, Chicago, Cleveland, and New York," as "a coordinating group of grassroots activists that looked to establish a concrete program for black self-determination centered in the cities." Already, "in the spring of 1964, together with Max Stanford of Revolutionary Action Movement (RAM); Baltimore Afro-American reporter William Worthy, and Patricia Robinson of Third World Press," the Boggses had "met with Malcolm in a Harlem luncheonette to discuss our proposal that he come to Detroit to help build the Organization for Black Power," but "Malcolm’s response was that we should go ahead while he served the movement as an 'evangelist.'"

New York politician Adam Clayton Powell Jr. used the term on May 29, 1966, during an address at Howard University: "To demand these God-given rights is to seek black power."

The first popular use of the term "black power" as a political and racial slogan was by Stokely Carmichael (later known as Kwame Ture) and Willie Ricks (later known as Mukasa Dada), both organizers and spokespersons for the Student Nonviolent Coordinating Committee (SNCC). On June 16, 1966, in a speech in Greenwood, Mississippi, after the shooting of James Meredith during the March Against Fear, Stokely Carmichael said:

This is the twenty-seventh time I have been arrested and I ain't going to jail no more! The only way we gonna stop them white men from whuppin' us is to take over. What we gonna start sayin' now is Black Power!

Stokely Carmichael saw the concept of "black power" as a means of solidarity between individuals within the movement. It was a replacement of the "Freedom Now!" slogan of Carmichael's contemporary, the non-violence leader Martin Luther King Jr. With his use of the term, Carmichael felt this movement was not just a movement for racial desegregation, but rather a movement to help end how American racism had weakened black people. He said, "'Black Power' means black people coming together to form a political force and either electing representatives or forcing their representatives to speak their needs." Carmichael and Charles V. Hamilton explain the term "black power" in their 1967 book Black Power: The Politics of Liberation: "It is a call for black people in this country to unite, to recognize their heritage, to build a sense of community. It is a call for black people to define their own goals, to lead their own organizations."

Black power adherents believed in black autonomy, with a variety of tendencies such as black nationalism, black self-determination, and black separatism. Such positions caused friction with leaders of the mainstream Civil Rights Movement, and thus the two movements have sometimes been viewed as inherently antagonistic. Civil Rights leaders often proposed passive, non-violent tactics while the black power movement felt that, in the words of Stokely Carmichael and Charles V. Hamilton, "a 'non-violent' approach to civil rights is an approach black people cannot afford and a luxury white people do not deserve." However, many groups and individuals—including Rosa Parks, Robert F. Williams, Maya Angelou, Gloria Richardson, and Fay Bellamy Powell—participated in both civil rights and black power activism. A growing number of scholars conceive of the civil rights and black power movements as one interconnected Black Freedom Movement.