Rafflesia schadenbergiana is a parasitic plant species in the family Rafflesiaceae, endemic to the island of Mindanao in the Philippines.

It has the largest flower among the Rafflesia species found in the Philippines, with a diameter of 52–80 cm (20–30 in).

This species was first collected in the vicinity of Mount Apo on Mindanao, during an expedition led by Alexander Schadenberg [de] and Otto Koch in 1882.

[2] It was not seen for more than a century and was assumed to be extinct[3] until Pascal Lays found a specimen of this species in South Cotabato in 1994 while studying the Tasaday people.

[4] A population of this rare Rafflesia species was recently discovered in Baungon in Bukidnon province, just outside the buffer zone of the Mount Kitanglad Natural Park in 2007.