Margaret Lindsay, Lady Huggins (born 14 August 1848, Dublin – died 24 March 1915, London), born Margaret Lindsay Murray, was an Irish-English scientific investigator and astronomer. With her husband William Huggins she was a pioneer in the field of spectroscopy and co-authored the Atlas of Representative Stellar Spectra (1899).
When Huggins was young, her mother died and her father remarried, leaving her on her own much of the time. Obituaries written by her friends attribute her interest in astronomy to her grandfather, a wealthy bank officer named Robert Murray. According to these sources, Margaret's grandfather taught her the constellations, and as a result of this she began studying the heavens with home-made instruments. She constructed a spectroscope after finding inspiration in articles on astronomy in the periodical Good Words.
Huggins' interest and abilities in spectroscopy led to her introduction by noted astronomical instrument maker Howard Grubb to the astronomer William Huggins, whom she married on 8 September 1875 in the Parish Church at Monkstown, County Dublin. Evidence suggests that Huggins was instrumental in instigating William Huggins' successful program in photographic research. She was a contributor to the Encyclopædia Britannica Eleventh Edition.
The London Times, in the notice of the death of Huggins, mentioned that Richard Proctor referred to her as the “Herschel of the Spectroscope”. In her will she bequeathed to Wellesley College and to Wellesley College Whitin Observatory some of her astronomy collection including cherished astronomical artifacts.