Juan Tanca Marengo (1895–1965) was an Ecuadorian physician.
He graduated as a doctor in 1920 and specialized in gastroenterology in Paris (1933).
In 1945 he chaired the National Patriotic Council and was received as a member of the brand new House of Ecuadorian Culture .
He was a member of the Board of Charities of Guayas (1947) and founder of the Society Against Cancer (SOLCA), also organized the Guayas Transit Commission.
This biographical article related to medicine in Ecuador is a stub.