A harbor or harbour (see spelling differences), or haven, is a place where ships, boats, and barges can seek shelter through stormy weather, or else are stored for future use. Harbors can be natural or artificial. An artificial harbor has deliberately-constructed breakwaters, sea walls, or jettys, or otherwise, they could have been constructed by dredging, and these require maintenance by further periodic dredging. An example of the former kind is at Long Beach Harbor, California, and an example of the latter kind is San Diego Harbor, California, which was, under natural conditions, too shallow for modern merchant ships and warships.

In contrast, a natural harbor is surrounded on several sides by prominences of land. An example of this kind of harbor is San Francisco Bay, California.

Harbors and ports are often confused with each other. A port is a facility for loading and unloading vessels; ports are usually located in harbors.

Artificial harbors are frequently built for use as ports. The largest artificially created harbor is Jebel Ali in Dubai. Other large and busy artificial harbors are located at: Rotterdam, The Netherlands; Port of Houston, Texas; Port of Long Beach, California; and Port of Los Angeles in San Pedro, California.

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Avram Finkelstein is an artist, writer, gay rights activist, and member of the AIDS art collective Gran Fury.

Finkelstein describes himself as a "red diaper baby", raised by leftist parents who encouraged him to develop an interest in radical politics. He began by protesting the Vietnam War in the 1960s, and has worked on many activist causes, including The Student Mobilization Committee, The Poor People's Campaign, The Coalition for Lesbian and Gay Rights, and was a founding member of the AIDS advocacy group ACT-UP. In 1986, Finkelstein was co-founder of the group Silence=Death Project, which created the "Silence=Death" anti-AIDS logo to combat institutional silence surrounding homophobia and HIV/AIDS, later donated to ACT-UP. In 1994, in preparation for the Gay Games in New York City, he wrote a tract for ACT-UP, entitled "Welcome to New York", which asked gay men and lesbians who attended the games and other festivities surrounding the twenty-fifth anniversary of the Stonewall Riots to take action to stop the AIDS epidemic.