Abstract: The waterproof illuminated disc flyer is an illuminated and waterproof flying plastic disc. The disc has upper and lower disc members sealed together at the outer perimeter of the discs, and is illuminated by light-emitting diodes (LEDs). A pushbutton switch and a battery compartment are enclosed within a waterproof enclosure formed between the upper and lower discs. A battery cover having a thin depressible plastic membrane enables a user to toggle the switch from outside the waterproof interior. The upper surface of the flying disc has a centered dome having six spokes, each spoke having a LED extending from alternating opposite ends.