Mary Cristy is the professional name of Luxembourgish singer Marie Ruggeri. She started her career in the 1960s as a child singer in Luxembourg and Germany under the pseudonyms Marie Tina and Marie Christina.
Following a move to Paris in the 1970s she performed using the name Mary Christy and appeared in the rock opera La Révolution Française by Schönberg.
She is best known internationally for representing Monaco in the Eurovision Song Contest 1976 in The Hague with the song "Toi, la musique et moi", which finished in 3rd place with 93 points, giving the principality its best result since winning the Contest five years earlier in Dublin.
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