奥莫尔塔格 Омуртаг，或称奥莫尔塔格汗 Омуртаг хан（？—831年）保加利亚大公（814年—831年在位）。克鲁姆大公之子，其父阵亡于与拜占庭帝国的战役。他开始在色雷斯边界修筑土墙，以阻挡拜占庭人。821年，奥莫尔塔格在大普列斯拉夫创建保加利亚的新都城。830年与塞尔维亚大公拉迪斯拉夫发生战争。

Omurtag (or Omortag) (Bulgarian:Омуртаг; original Greek:Μορτάγων and Ομουρτάγ) was a Great Khan (Kanasubigi) of Bulgaria from 814 to 831. He is known as "the Builder".

In the very beginning of his reign he signed a 30-year peace treaty with the neighboring Eastern Roman Empire which remained in force to the end of his life. Omurtag successfully coped with the aggressive policy of the Frankish Empire to take Bulgaria's north-western lands and suppressed the unrest among several Slavic tribes. He made administrative reforms which increased the power and the authority of the central government. His reign was marked with a strong development of the Bulgarian architecture with a number of significant construction projects.