Otfrid of Weissenburg (c. 800 - after 870 AD) was a prominent monk at the abbey of Weissenburg, located in modern-day Wissembourg in Alsace. He is best known for authoring the "Evangelienbuch," a gospel harmony written in rhyming couplets in the South Rhine Franconian dialect of Old High German. This work, completed between 863 and 871, is significant as it represents the first substantial literary work in German literature to use rhyme, as opposed to the alliterative style of earlier German poetry.

Otfrid was born around the year 800 and likely entered the monastic life at Weissenburg at a young age. He was educated at Fulda under Hrabanus Maurus between 832 and 842 and later returned to Weissenburg to serve as magister scholae, responsible for teaching novices. His scholarly work included biblical commentaries and glossaries, contributing to the expansion of the monastery's library.

The "Evangelienbuch" is notable for its dedication to Louis the German, Solomon I, Bishop of Constance, and Otfrid's friends Hartmuat and Werinbert, monks at the Abbey of St. Gall. The work was innovative not only for its use of rhyme but also for being written in the vernacular, which Otfrid justified in a preface explaining his choice to write in his native dialect.

Otfrid's death is believed to have occurred around 870, although the exact date remains uncertain. His legacy endures as the first known German poet, and his work continues to be a subject of study for its literary and historical significance.