Lillian Hardin Armstrong (née Hardin; February 3, 1898 – August 27, 1971) was an American jazz pianist, composer, arranger, singer, and bandleader. She was the second wife of Louis Armstrong, with whom she collaborated on many recordings in the 1920s.

Her compositions include “Struttin’ with Some Barbecue”, “Don’t Jive Me”, “Two Deuces”, “Knee Drops”, “Doin’ the Suzie-Q”, “Just for a Thrill” (which was a hit when revived by Ray Charles in 1959), “Clip Joint”, and “Bad Boy” (a hit for Ringo Starr in 1978). Armstrong was inducted into the Memphis Music Hall of Famein 2014.

She was born Lillian Hardin in Memphis, Tennessee, where she grew up in a household with her grandmother, Priscilla Martin, a former slave from near Oxford, Mississippi. Martin had a son and three daughters, one of whom was Dempsey, Lil’s mother. Priscilla Martin moved her family to Memphis to escape from her husband, a trek the family made by mule-drawn wagon. Dempsey married Will Harden, and Lil was born on February 3, 1898. Will died when Lil was seven, though Dempsey later remarried to John Miller.

During her early years, Hardin was taught hymns, spirituals, and classical music on the piano. She was drawn to popular music and later blues.