Polypedates otilophus (also known as the file-eared tree frog, Borneo eared frog, or bony-headed flying frog) is a species of frog in the family Rhacophoridae. It is endemic to Borneo where it is widespread and found in Brunei, Indonesia, and Malaysia, typically in the lowlands but sometimes as high as 1,100 m (3,600 ft) above sea level.