|Hybrid parentage||'Nourin No.1' × 'Nourin No.22'|
|Subspecies||O. s. subsp. japonica|
|Cultivar group||temperate japonica|
|Cultivar||Nourin No.100 (Etsunan No.17)|
Koshihikari (Japanese: コシヒカリ, 越光, Hepburn: Koshihikari) is a popular cultivar of Japonica rice cultivated in Japan as well as Australia and the United States.
Koshihikari was first created in 1956 by combining 2 different strains of Nourin No.1 and Nourin No.22 at the Fukui Prefectural Agricultural Research Facility. It is one of the most highly grown varieties of rice in Japan and is exported to other countries as a premium product.
The character for koshi (越) is used to represent the old Koshi Province, which stretched from present-day Fukui to Yamagata. Koshihikari can be translated as "the light of Koshi".
Other rice varieties close to its strains, such as Akitakomachi, Hitomebore, and Hinohikari were subsequently created by cross-breeding Koshihikari with other Japanese varieties of rice.