Agathis philippinensis (in Tagalog: Almasiga or Dayungon) is a species of large Agathis tree native to the Philippines, Sulawesi and Halmahera, where it occurs in upland tropical rainforest at 450-2,200 m altitude, rarely as low as 250 m in northern Luzon. In the Philippines, the almasiga belongs to very ancient plants alongside ferns and tree ferns, cycas, horsetails, spikemosses and mosses.