In Egyptian mythology, Buchis (Ancient Greek: Βουχις, Coptic: ⲃⲱⲱϩ, ⲃⲟϩ)[1] (also spelt Bakh and Bakha) was the deification of the kꜣ ("power, life-force", Egyptological pronunciation ka) of the war god Montu[2] as a sacred bull that was worshipped in the region of Hermonthis.

[3]: 95  In order to being chosen as the Buchis incarnation of Montu, a bull was required to have a white body and black face.

[3]: 95–100 Unlike the other Egyptian sacred bulls – the Apis and the Mnevis – the Buchis cult started towards the end of the pharaonic period, with the earliest known burial taking place in regnal year 14 of Nectanebo II (mid 4th century BC).

However, four different bull cults dedicated to Montu were known in earlier times in Upper Egypt, and it seems that the Buchis was the result of their syncretism.

[3]: 95  Eventually, the Buchis bull was identified as a form of the Apis, and consequently became considered an incarnation of Osiris.