Amy Lawrence Lowell (February 9, 1874 – May 12, 1925) was an American poet of the imagist school. She posthumously won the Pulitzer Prize for Poetry in 1926.

Amy Lowell was born on February 9, 1874, in Brookline, Massachusetts, the daughter of Augustus Lowell and Katherine Bigelow Lowell. A member of the Brahmin Lowell family, her siblings included the astronomer Percival Lowell, the educator and legal scholar Abbott Lawrence Lowell, and Elizabeth Lowell Putnam, an early activist for prenatal care. They were the great-grandchildren of John Lowell and, on their mother's side, the grandchildren of Abbott Lawrence.

School was a source of considerable despair for the young Amy Lowell. She considered herself to be developing "masculine" and "ugly" features and she was a social outcast. She had a reputation among her classmates for being outspoken and opinionated. At fifteen she wanted to be a photographer, poet, and coach racer.

Lowell never attended college because her family did not consider it proper for a woman to do so. She compensated for this lack with avid reading and near-obsessive book collecting. She lived as a socialite and travelled widely, turning to poetry in 1902 (aged 28) after being inspired by a performance of Eleonora Duse in Europe. After beginning a career as a poet when she was well into her 30s, Lowell became an enthusiastic student and disciple of the art.

Lowell was a lesbian, and in 1912 she met the actress Ada Dwyer Russell, who would become her lover. Russell is the subject of many of Lowell's more erotic works, most notably the love poems contained in 'Two Speak Together', a subsection of Pictures of the Floating World. The two women traveled to England together, where Lowell met Ezra Pound, who at once became a major influence and a major critic of her work. Pound considered Lowell's embrace of Imagism to be a kind of hijacking of the movement. Lowell has been linked romantically to writer Mercedes de Acosta, but the only evidence of any contact between them is a brief correspondence about a planned memorial for Duse.

Lowell was a short but imposing figure who kept her hair in a bun and wore a pince-nez.

Lowell publicly smoked cigars, as newspapers of the day frequently mentioned. A glandular problem kept her perpetually overweight. Poet Witter Bynner once said, in a comment frequently misattributed to Ezra Pound, that she was a "hippopoetess". Her admirers defended her, however, even after her death. One rebuttal was written by Heywood Broun in his obituary tribute to Amy. He wrote, "She was upon the surface of things a Lowell, a New Englander and a spinster. But inside everything was molten like the core of the earth ... Given one more gram of emotion, Amy Lowell would have burst into flame and been consumed to cinders."

Lowell died of a cerebral hemorrhage in 1925, at the age of 51, and is buried at Mount Auburn Cemetery. The following year, she was awarded the Pulitzer Prize for Poetry for What's O'Clock. That collection included the patriotic poem "Lilacs", which Louis Untermeyer said was the poem of hers he liked best.