Symplocos deflexa is a tree in the family Symplocaceae, native to Borneo. The specific epithet deflexa means 'drooping' and refers to the orientation of the infructescence.
Symplocos deflexa grows up to 6m (20feet) tall, with a stem diameter of up to . The papery leaves are elliptic and measure up to long. The inflorescences feature racemes, each of up to six fragrant flowers.
Symplocos deflexa is endemic to Borneo, where it is confined to areas of Ranau District in Sabah, including Mount Kinabalu and Tenompok Forest Reserve. Its habitat is montane forests, at elevations of .