The Yezo sika deer (Cervus nippon yesoensis,[1][2] Japanese: エゾシカ / 蝦夷鹿, romanized: yezoshika,[3] Ainu: ユク yuk[4][5]) is a subspecies of sika deer that inhabits the northern Japanese island of Hokkaido.

The Hokkaido sika are endemic, although it is not known whether they originated there or migrated from Honshū or areas further south.

Genetic study has shown that the separation of the sika population occurred less than half a million years ago.

[7] The indigenous Ainu people of Hokkaido have hunted them for centuries and relied on them as a major food source.

By SCI measurement, the Hokkaido sika produces the highest scores, although very few have been listed.