Guido Maria Dreves (27 October 1854 – 1 June 1909) was a German Jesuit, hymnologist and hymnwriter.
After completing his education, he immediately entered the Jesuit order in November 1869.
He completed his novitiate in Sigmaringen and then studied at the Jesuitenkolleg Münster [de], at the religious house in Bleijenbeek Castle in the Netherlands and at the Jesuit College of Ditton-Hall in Shropshire, England.
[1][2] He is especially important as the author and editor of the Analecta hymnica medii aevi, the largest collection of medieval Latin poetry to date (hymns, sequences, tropes, rhyming offices and psalters).
With astonishing diligence, Dreves searched libraries all over Europe for old manuscripts and incunables.