Ammittamru I (known in some sources as Amishtammru I or Amistammru I, Akkadian: 𒄠𒈪𒄑𒌓𒊑 Ammîstamri) was a king of the ancient Syrian city of Ugarit who ruled c. 1350 BC.^[1]

The first mention of him is EA 45 sent by Ammittamru I to Egypt, either in the late reign of Amenophis III^[1][2] or in the first years of Akhenaten.^[1] The damaged letter includes emphatic promises of allegiance to Egypt, as the occasion is said to be the repeated threats from a king of a land whose name is broken off, possibly the land of the Hittites, due to their long struggle with the Egyptians.^[1] Another good example for such letters that show submission to Egypt is KTU 2.23 = RS 16.078+.15-24 sent to a contemporary pharaoh that says:

... And I am [your servant] who begs [for life to] the Sun, the great king, my lord. Then do I not pray for the life of his soul before Ba'al Saphon my lord, and length of days for my lord before Amun and before the gods of Egypt who protect the soul of the Sun, the Great King, my lord? ^[3]

After his death, he was succeeded by his son, Niqmaddu II.^[4]