Rudolf Ewald Stier (17 March 1800 – 16 December 1862), was a German Protestant churchman and mystic.
Stier was born at Fraustadt (Wschowa) in South Prussia and studied at the University of Halle and Humboldt University, Berlin, first law and afterwards theology; he continued his theological studies later at the pastoral seminary of Wittenberg.
Stier published a new edition of Martin Luther's Catechism and a translation of the Bible based on that of Luther; but he is noted chiefly for his thoughtful, devotional and mystical commentary on the Words of the Lord (Reden des Herrn, 3 vols., 1843; Eng.
He wrote commentaries on the Psalms, Second Isaiah, Proverbs, Ephesians, Hebrews, Epistles of James and Jude.
His other works include: Die Reden der Apostel (2 vols, 1824–1830; Eng.