Count Dénes Andrássy de Csíkszentkirály et Krasznahorka (19 November 1835 – 23 February 1913) was a Hungarian nobleman, who served as chairman of the Hungarian Heraldic and Genealogical Society.
He was a wealthy, generous and enlightened patron of the arts.
His parents were Count György Andrássy and Countess Franciska Königsegg-Aulendorfi.
He married Franciska Hablawetz.
After her death he founded Franciska Relic Museum in his birthplace.
He was a member of the Hungarian Academy of Sciences.