James Augustus Johnson (May 16, 1829 – May 11, 1896) was an American physician, lawyer, and politician.

[1] When he was quite young he moved with his parents to Arkansas where he attended the common schools.

He studied medicine and was graduated from Jefferson Medical College in Philadelphia, Pennsylvania.

[2] Johnson served as a member of the California State Assembly in 1859 and 1860, representing Sierra County.

He continued practicing law until his death on May 11, 1896, in San Francisco, at age 66.