Harvey Bernard Milk (May 22, 1930 – November 27, 1978) was an American politician and the first openly gay man to be elected to public office in California, as a member of the San Francisco Board of Supervisors.

Milk was born and raised in New York. He acknowledged his homosexuality in adolescence, but secretly pursued sexual relationships well into adulthood. The counterculture of the 1960s caused him to shed many of his conservative views about individual freedom and sexual expression. Milk moved to San Francisco in 1972 and opened a camera store. After holding an assortment of jobs and frequently changing addresses, he settled in the Castro, a neighborhood that was experiencing a mass immigration of gay men and lesbians. He ran for city supervisor in 1973, but the existing gay political establishment resisted him. Milk's campaign was compared to theater due to his personality, earning media attention and votes, although not enough to be elected. He campaigned again in the next two supervisor elections, dubbing himself the "Mayor of Castro Street". The voter response caused him to also run for the California State Assembly. Due to his growing popularity, he led the gay rights movement in battles against anti-gay initiatives. Milk was elected city supervisor in 1977 after San Francisco began to choose neighborhood representatives rather than city-wide ones. During Milk's almost eleven months in office, he sponsored a bill banning discrimination based on sexual orientation in public accommodations, housing, and employment. The supervisors passed the bill by a vote of 11–1, and Mayor George Moscone signed it into law. On November 27, 1978, Milk and Moscone were assassinated by Dan White, a disgruntled former city supervisor who cast the sole vote against Milk's bill.

Despite his short political career, Milk became an icon in San Francisco and a martyr in the LGBTQ community. In 2002, Milk was called "the most famous and most significant openly LGBTQ official ever elected in the United States". Anne Kronenberg, his final campaign manager, wrote of him: "What set Harvey apart from you or me was that he was a visionary. He imagined a righteous world inside his head and then he set about to create it for real, for all of us." Milk was posthumously awarded the Presidential Medal of Freedom in 2009.

Harvey Bernard Milk was born in the New York City suburb of Woodmere, to William Milk and Minerva Karns. He was the younger son of Litvak parents and the grandson of Morris Milk, a department store owner who helped to organize the first synagogue in the area. Milk was raised in a Jewish household. His mother kept a kosher home. Although as an adult he did not consider himself a religious person, his connection to the Jewish faith profoundly shaped his worldview. His family experienced great discrimination for being Jewish. His grandfather, who created the first synagogue in the town, was a Yiddish-speaking peddler who came to America from Lithuania. As a child, Milk was teased for his protruding ears, big nose, and oversized feet, and tended to grab attention as a class clown. While he was in school, he played football and developed a passion for opera. Under his name in the high school yearbook, it read, "Glimpy Milk—and they say WOMEN are never at a loss for words".

Milk graduated from Bay Shore High School in Bay Shore, New York, in 1947 and attended New York State College for Teachers in Albany (now the State University of New York at Albany) from 1947 to 1951, majoring in mathematics. He also wrote for the college newspaper. One classmate remembered, "He was never thought of as a possible queer—that's what you called them then—he was a man's man".

After graduation, Milk joined the United States Navy during the Korean War. He served aboard the submarine rescue ship USS Kittiwake (ASR-13) as a diving officer. Milk later transferred to Naval Station, San Diego to serve as a diving instructor. In 1955, he resigned from the Navy at the rank of Lieutenant (junior grade), forced to accept an "other than honorable" discharge and leave the service rather than be court-martialed because of his homosexuality.

Milk's early career was marked by frequent changes; in later years he would take delight in talking about his metamorphosis from a middle-class Jewish boy. He began teaching at George W. Hewlett High School on Long Island. In 1956, he met Joe Campbell at the Jacob Riis Park beach, a popular cruising location for gay men in Queens. Milk pursued Campbell passionately. Milk continued to write Campbell romantic notes and poems after they moved in together. Seeking a warmer climate with milder winters, Milk and Campbell left New York in 1957 and moved to Dallas; after they struggled to find employment and were disappointed with the city's social scene compared to New York, they moved back to New York. In New York, Milk worked as a public school teacher on Long Island and then a stock analyst in Manhattan. In 1961, Campbell and Milk separated after almost six years.

Milk tried to keep his early romantic life separate from his family and work. Once again bored and single in New York, he thought of moving to Miami to marry a lesbian friend to "have a front and each would not be in the way of the other". However, he decided to remain in New York, where he secretly pursued gay relationships. In 1962, Milk became involved with Craig Rodwell, who was 10 years younger. Though Milk courted Rodwell ardently, waking him every morning with a call and sending him notes, Milk was uncomfortable with Rodwell's involvement with the New York Mattachine Society, a gay-rights organization. When Rodwell was arrested for walking in Riis Park, and charged with inciting a riot and with indecent exposure (the law required men's swimsuits to extend from above the navel to below the thigh), he spent three days in jail. The relationship soon ended as Milk became alarmed at Rodwell's tendency to agitate the police.