Hironari Yamazaki is a Japanese entertainer primarily known for his work as a comedian, who has also performed voice acting roles in anime and dubbed films. He was born on January 14, 1976, in Kasukabe, Saitama Prefecture, Japan. He is often referred to by the nickname Zakiyama.

Yamazaki's principal career is in comedy. He formed the manzai comedy duo Untouchable with Hidetsugu Shibata in 1994. The duo gained significant fame after winning the M-1 Grand Prix manzai competition in 2004. As a regular presence on numerous television variety shows, he is known for his rowdy character and improvisational comedic style.

While his profile is rooted in live-action entertainment, Yamazaki has contributed his voice to a number of animated projects. Notably, he voiced the character Kumo no Choro (Elder of the Clouds) in the 2020 anime film Eiga Soreike! Anpanman: Fuwafuwa Fuwari to Kumo no Kuni. His other voice roles have primarily been in Japanese-dubbed versions of foreign animated films. These include providing the voice for Skipper, the leader of the penguins, in the Japanese dubs of Madagascar and Madagascar: Escape 2 Africa. He also voiced the character Hackus in the Japanese dubbed version of The Smurfs 2. Additionally, he appeared as a voice actor playing a fictionalized version of himself in an episode of the long-running anime series Crayon Shin-chan.