WISE J033605.05−014350.4, abbreviated to WISE J0336−0143 or W0336, is a binary system comprising two planetary-mass Y-type brown dwarfs tightly orbiting around their common center of mass. The system is located in the constellation Eridanus, about 33 light-years away from the Sun. It was discovered in images taken by the Wide-field Infrared Survey Explorer (WISE) and formally published by Gregory N. Mace and collaborators in March 2013. Astronomers suspected the brown dwarf was a binary system upon follow-up observations showing it had an unusual infrared spectrum, but its binarity was not confirmed until the James Webb Space Telescope resolved the system's components in high-resolution NIRCam imaging in September 2022, with its results published in March 2023.