Blessed Anne Catherine Emmerich (Anna Katharina Emmerick; 8 September 1774 – 9 February 1824) was a Roman Catholic Augustinian Canoness Regular of Windesheim, mystic, Marian visionary, ecstatic and stigmatist.

During her bedridden years, a number of well-known figures were inspired to visit her. The poet Clemens Brentano interviewed her at length and wrote two books based on his notes of her visions. The authenticity of Brentano’s writings has been questioned and critics have characterized the books as “conscious elaborations by a poet” and a “well-intentioned fraud” by Brentano. She was born in Flamschen, a farming community at Coesfeld, in the Diocese of Münster, Westphalia, Germany, and died at age 49 in Dülmen, where she had been a nun, and later became bedridden. Emmerich is notable for her visions on the life and passion of Jesus Christ, reputed to be revealed to her by the Blessed Virgin Mary under religious ecstasy.

Emmerich was beatified on October 3, 2004, by Pope John Paul II. However, the Vatican focused on her own personal piety rather than the religious writings associated to her by Clemens Brentano. Emmerich has a widespread devotion among Catholics. Her documents of postulation towards canonization is handled by the Priestly Fraternity of St. Peter.