Hashimoto Sanai

• Born: 1834
• Died: 1859
• Other Names: 綱紀 (Kôki)
• Japanese: 橋本 左内 (Hashimoto Sanai)

Hashimoto Sanai was a Fukui han court physician who contributed to the translation of Western materials in the mid-1850s.

In 1856, he was appointed organizer of the Fukui domain school Meidôkan, and led classes for domain retainers' children in his spare time.

He was executed in 1859.