Ōbaku (黄檗 Japanese Ōbaku, pinyin Huángbò) is the Amur Corktree. It may refer to:
- Mount Huangbo (), a mountain in China's Fujian province, noted for its Buddhist temples
- Mount Ōbaku (, Ōbaku-san), a mountain in the city of Uji in Japan
- Huangbo Xiyun (黄檗希運), a Chinese Chan Buddhist master
- The Japanese Ōbaku School (黄檗宗) of Zen Buddhism
- Ōbaku Station (Keihan)・Ōbaku Station (JR West), train stations in Uji, Japan
Obaku may also refer to:
- Obaku, Nigeria, a village