Passu Sar (or Passu Sar, Passu I) is a mountain peak in the Batura Muztagh, a sub-range of the Karakoram mountain range, located in the Gilgit District of Gilgit-Baltistan, Pakistan, west of the Hunza Valley. It is the high point of the Passu massif, which also includes Passu Diar (or "Passu East", "Pasu II").