The Greater Ulu Muda Forest Complex (GUMFC) is a large expanse of lowland dipterocarp forest in Baling and Sik Districts, Kedah, Malaysia, on the border with Thailand.

The area has high biodiversity thanks to relatively low rates of poaching and human intrusion.

[1] The water that it provides through the man-made Muda, Pedu and Ahning lakes provide water to the Muda agricultural area as well as much of Kedah, Penang and Perlis.

The majority of the forest is not very accessible, the easiest point of entry being the KOPAM jetty on Muda Lake.

The reserve adjoins San Kala Khiri National Park in Thailand.