(458732) 2011 MD5

 is an Apollo near-Earth asteroid around 1.2 km in diameter. It is the largest asteroid known to have passed closer than the Moon. On 17 September 1918 the asteroid passed 0.00234 AU from Earth with a peak apparent magnitude of around 8.4. The 1918 close approach distance is known with an accuracy of roughly ±120 km. The asteroid had come to opposition (opposite the Sun in the sky) on 9 August 1918 at magnitude 16.

was not discovered until 30 June 2011, when the asteroid was 1.3 AU from Earth. As of 2023, the asteroid has a 12-year observation arc and a well determined orbit.