Otto the Younger of Hesse

Otto the Younger of Hesse, called Otto the Marksman (before 1322–1366), was the only son of Landgrave Henry II of Hesse and Elisabeth of Thuringia. In 1338 he married Elisabeth of Cleves; the marriage was childless. From 1339 he was co-regent with his father and imperial governor in Mühlhausen.

He fought in his father's victorious feuds against Abbot Henry VII of Fulda, ravaging Hausen in 1356 and Hünfeld in 1361. He died suddenly at Spangenberg in December 1366, rumoured poisoned by the Fulda abbot.