John Campbell, 3rd Earl of Breadalbane (1796–1862) was a Scottish nobleman known for his role in the management of his family's estates in Scotland. He inherited the title from his father, John Campbell, 2nd Earl of Breadalbane, and was involved in various political and social issues of his time. The 3rd Earl was also recognized for his contributions to the development of the Highlands and was a prominent figure in the Scottish community. His efforts included promoting agricultural improvements and supporting local industries, which helped to modernize the region during the 19th century.