2091 Sampo, provisional designation 1941 HO, is a stony, slowly rotating asteroid from the outer region of the asteroid belt, about 30 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory on 26 April 1941.
The asteroid is a member of the Eos family, a group of asteroids thought to have formed by a single collision that disrupted their 240-kilometer sized parent body some 1.1 billion years ago. It orbits the Sun at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,911 days). Its orbit shows an eccentricity of 0.06 and is tilted by 11 degrees to the plane of the ecliptic. The S-type asteroid has a geometric albedo in the range of 0.12–0.27, according to the surveys carried out by IRAS, Akari, and NEOWISE. It has a long rotation period of 71.3 hours.
It was named after the wonder-object Sampo from Finnish mythology. It is mentioned in the national oral folklore and mythology epic, Kalevala, after which the minor planet 1454 Kalevala is named. Sampo was to produce every kind of fortune. When Kalevala and Pohjola (also see 3606 Pohjola) were fighting for its possession it broke into pieces.