Otto I of Hesse (c. 1272 –17 January 1328) was Landgrave of Hesse from 1308 until his death.Otto was born in Marburg a son of Henry I Landgrave of Hesse and his first wife Adelheid of Brunswick-Lunenburg. Following the death of his father in 1308 he inherited Upper Hesse the Land on the Lahn which included Marburg Giessen Grünberg and Alsfeld. After his half-brother John died in 1311 he also became landgrave of Lower Hesse.
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