Nubwoserre Ya'ammu (also rendered as Ya'amu,[4] Jamu and Jaam[3]) was a ruler during the Second Intermediate Period of Egypt.

[5] His personal name never appears inside a cartouche, and is simply reported as "the son of Ra, Ya'ammu".

Similar to his suggested predecessor Yakbim Sekhaenre, there is no direct evidence that Ya'ammu's throne name was Nubwoserre: the association is based on stylistic features of the seals and was proposed by William Ayres Ward[6] and later elaborated by Ryholt;[7] Daphna Ben-Tor disputed this identification, pointing out that the seals of the many rulers living during this period are too similar to make such correlations on the basis of mere design features.

[8] Assuming that Ward and Ryholt were right, Nubwoserre Ya'ammu is attested by 26 rather crude scarab seals (more precisely, 19 naming Nubwoserre and 7 naming Ya'ammu);[1][9] based on that, Ryholt estimated for him a reign length of around ten years, in the interval 1780–1770 BCE.

Israeli Egyptologist Raphael Giveon identifies Ya'ammu with his proposed predecessor Yakbim.