Jacob Mendes Da Costa, or Jacob Mendez Da Costa (February 7, 1833, Saint Thomas/São Tomé, U.S. Virgin Islands, Caribbean – September 12, 1900) was an American physician and surgeon.
He taught at the Jefferson Medical College (now Thomas Jefferson University).
He is particularly known for discovering Da Costa's syndrome (also known as soldier's heart), an anxiety disorder that he first observed in soldiers in the American Civil War and documented in an 1871 study.[1]