Other
- The name of a former samurai clan, the Hayashi clan (disambiguation), several members of which served hereditarily as foreign policy advisors in the Tokugawa shogunate
- The daimyō family of Jōzai Domain (Jōzai han)
- The name of one of the four go houses in the Edo period
- A dish consisting of stewed beef and onions in gravy: Hayashi rice
- Hayashi (music) (囃子?), the term for a musical accompanist section, usually consisting primarily of percussion, in traditional Japanese theatre and dance.
- 4771 Hayashi, an asteroid discovered in 1989
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