Leroy Lansing Janes (1838–1909) was an American educator, hired by Kumamoto Domain in early Meiji period Japan.

A native of Ohio, Janes was a veteran of the Civil War, where he served in the artillery with the rank of captain after graduation from the United States Military Academy at West Point.

Janes established a curriculum entirely in English, covering mathematics, history, geography and natural sciences.

Some 30 of his pupils converted to Christianity under his influence, including Tokio Yokoi, Kozaki Hiromichi, Ebina Danjo, and Ukita Kazutami [ja].

The Kumamoto Yōgakkō was forced to close in August 1876 due to opposition from conservative elements within Kumamoto domain, and Janes, together with his students, relocated to Kyoto, where they joined the Dōshisha school, which had been founded a year earlier by Niijima Jō.