Ammi Ruhamah Mitchell (May 8, 1762 – May 14, 1824) was an 18th- and 19th-century American physician. He also served ten years in the Massachusetts Legislature.
== Early life and education ==
Mitchell was born on May 8, 1762, in North Yarmouth, Province of Massachusetts Bay (today's North Yarmouth, Maine), to Judge David Mitchell and Lucretia Loring. His father was a judge of the Court of Common Pleas of the County of Cumberland for nineteen years.
He studied medicine in Portsmouth, Province of New Hampshire.