The brothers Eugene Haag (11 February 1808 – 5 March 1868) and Émile Haag (18 November 1810 – 11 May 1865) were two French Protestant historians and theologians, known collectively as the Frères Haag or the Haag Brothers.

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They were born in Montbéliard. Both died in Paris, Eugene at the age of 60 and Émile at the age of 54.