14827 Hypnos (provisional designation: 1986 JK) is a highly eccentric, sub-kilometer-sized carbonaceous asteroid that is thought to be an extinct comet. It is classified as a near-Earth object and potentially hazardous asteroid of the Apollo group.

The asteroid was discovered by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California on 5 May 1986. It was named after Hypnos, the Greek god of sleep.

Hypnos orbits the Sun at a distance of 0.9–4.7 AU once every 4 years and 9 months (1,749 days). Its orbit has a high eccentricity of 0.67 and an inclination of 2° with respect to the ecliptic. It is frequently perturbed by Jupiter.

The body's observation arc begins at Anderson Mesa Station the night prior to its official discovery observation at Palomar.

As a near-Earth object and potentially hazardous asteroid Hypnos has an Earth minimum orbital intersection distance of 0.0147 AU (2,200,000 km), which corresponds to 5.7 lunar distances.

In 1958, Hypnos passed less than 0.03 AU from both Earth and Mars. Neither planet has been approached so closely by Hypnos since the 862 AD pass of Earth, or will be until the 2214 pass of Earth.^{[citation needed]} It is also a Mars-crosser.

Hypnos may be the nucleus of an extinct comet that is covered by a crust several centimeters thick that prevents any remaining volatiles from outgassing.

Hypnos is an assumed carbonaceous C-type asteroid.