Engelthal Abbey or St. Mary's Abbey, Engelthal, (German: Kloster Engelthal; Latin: Abbatia B.M.V. in Valle Angelorum) is a Benedictine nunnery in the Wetterau region, Hesse, Germany.

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Engelthal Abbey was a Cistercian nunnery from its foundation in 1268, until the secularisation of 1803, when it passed into the possession of the Imperial Counts of Leiningen-Westerburg-Neuleiningen and later in the 19th century was sold to the Counts of Solms-Wildenfels.^[1][2]

In 1962 it was re-settled by the Benedictine nuns of Herstelle Abbey. The house was raised to the status of abbey in 1965, and belongs to the Beuronese Congregation of the Benedictine Confederation.^[1][2]

Besides the normal Benedictine duty of hospitality, the nuns of Engelthal are also involved in the restoration of ecclesiastical works of art.^[3]