Alan Lomax (/ˈloʊmæks/; January 31, 1915 – July 19, 2002) was an American ethnomusicologist, best known for his numerous field recordings of folk music during the 20th century. He was a musician, folklorist, archivist, writer, scholar, political activist, oral historian, filmmaker and son of folklorist John Lomax. Lomax produced recordings, concerts, and radio shows in the U.S. and in England which played an important role in preserving folk music traditions in both countries and helped start both the American and British folk revivals of the 1940s, 1950s, and especially the early 1960s. He collected material first with his father, folklorist and collector John Lomax, and later, alone and with others. Lomax recorded thousands of songs and interviews for the Archive of American Folk Song, of which he was the director, at the Library of Congress on aluminum and acetate discs.

After 1942, when Congress terminated the Library of Congress's funding for folk song collecting, Lomax continued to collect independently in Britain, Ireland, Caribbean region, Italy, Spain, and United States, using the latest recording technology, assembling an enormous collection of American and international culture. In March 2004, the material captured and produced without Library of Congress funding was acquired by the Library, which "brings the entire seventy years of Alan Lomax's work together under one roof at the Library of Congress, where it has found a permanent home." With the start of the Cold War, Lomax continued to advocate for a public role for folklore, even as academic folklorists turned inward. He devoted much of the latter part of his life to advocating what he called Cultural Equity, which he sought to put on a solid theoretical foundation through to his Cantometrics research (which included a prototype Cantometrics-based educational program, the Global Jukebox). In the 1970s and 1980s, Lomax advised the Smithsonian Institution's Folklife Festival and produced a series of films about folk music, American Patchwork, which aired on PBS in 1991. In his late 70s, Lomax completed the long-deferred memoir The Land Where the Blues Began (1993), linking the birth of the blues to debt peonage, segregation, and forced labor in the American South.

Lomax's greatest legacy is in preserving and publishing recordings of musicians in many folk and blues traditions around the U.S. and Europe. Artists Lomax is credited with discovering and bringing to a wider audience include blues guitarist Robert Johnson, protest singer Woody Guthrie, folk artist Pete Seeger, country musician Burl Ives, Scottish Gaelic singer Flora MacNeil, and country blues singers Lead Belly and Muddy Waters, among many others. "Alan scraped by the whole time, and left with no money," said Don Fleming, director of Lomax's Association for Culture Equity. "He did it out of the passion he had for it, and found ways to fund projects that were closest to his heart".

Lomax was born in Austin, Texas, in 1915, the third of four children born to Bess Brown and pioneering folklorist and author John A. Lomax. Two of his siblings also developed significant careers studying folklore: Bess Lomax Hawes and John Lomax Jr.

The elder Lomax, a former professor of English at Texas A&M University and a celebrated authority on Texas folklore and cowboy songs, had worked as an administrator, and later Secretary of the Alumni Society, of the University of Texas.

Due to childhood asthma, chronic ear infections, and generally frail health, Lomax had mostly been home schooled in elementary school. In Dallas, he entered the Terrill School for Boys (a tiny prep school that later became St. Mark's School of Texas). Lomax excelled at Terrill and then transferred to the Choate School (now Choate Rosemary Hall) in Connecticut for a year, graduating eighth in his class at age 15 in 1930.

Owing to his mother's declining health, however, rather than going to Harvard University as his father had wished, Lomax matriculated at the University of Texas at Austin. A roommate, future anthropologist Walter Goldschmidt, recalled Lomax as "frighteningly smart, probably classifiable as a genius", though Goldschmidt remembers Lomax exploding one night while studying: "Damn it! The hardest thing I've had to learn is that I'm not a genius." At the University of Texas, Lomax read Nietzsche and developed an interest in philosophy. He joined and wrote a few columns for the school paper, The Daily Texan but resigned when it refused to publish an editorial he had written on birth control.

At this time he also he began collecting "race" records and taking his dates to black-owned nightclubs, at the risk of expulsion. During the spring term his mother died, and his youngest sister Bess, age 10, was sent to live with an aunt. Although the Great Depression was rapidly causing his family's resources to plummet, Harvard came up with enough financial aid for the 16-year-old Lomax to spend his second year there. He enrolled in philosophy and physics and also pursued a long-distance informal reading course in Plato and the Pre-Socratics with University of Texas professor Albert P. Brogan. He also became involved in radical politics and came down with pneumonia. His grades suffered, diminishing his financial aid prospects.