Léonie Fuller Adams (9 December 1899 – 27 June 1988) was an American poet. She was appointed the seventh Poet Laureate Consultant in Poetry to the Library of Congress in 1948.

Adams was born in Brooklyn, New York, and raised in an unusually strict environment. She was not allowed on the subway until she was eighteen, and even then her father accompanied her. She studied at Barnard College where she was a contemporary and friend of roommate Margaret Mead. While still an undergraduate, she showed remarkable skill as a poet, and at this time her poems began to be published. In 1924, she became the editor of The Measure.

Her first volume of poetry, titled Those Not Elect, was in 1925.

In the spring of 1928, she had a brief affair with Edmund Wilson. Léonie apologized to Wilson for having "moped and quarreled" on the day she left for France. While in London, Leonie met H.D., who introduced her to several figures in the London literary scene; in Paris she was invited to tea by Gertrude Stein. At the beginning of 1929, when Wilson wrote to her that he was thinking of marrying another woman, Leonie wrote back that she had had a pregnancy and hinted that she had had a miscarriage, mentioning the need for a visit to a London doctor in October. Guilt over the pregnancy — both Wilson, and a former student, Judith Farr, reported that Léonie had a gift for making others feel guilty — combined with his heavy drinking, and indecision in other elements of his personal life led Wilson to a nervous collapse. Louise Bogan later revealed to him that Léonie's pregnancy had been imaginary, and this caused a temporary rift between Bogan and Adams.