John Campbell, 2nd Earl of Breadalbane (c. 1662–1752), was a Scottish nobleman known for his role in the political landscape of 18th-century Scotland. He succeeded his father, John Campbell, 1st Earl of Breadalbane, and became a prominent figure in the Scottish Parliament. His influence extended to various political matters, particularly during the Jacobite risings. The 2nd Earl was also recognized for his efforts in managing his estates and promoting agricultural improvements. He was a supporter of the Union of 1707, which united the Kingdom of Scotland and the Kingdom of England into the Kingdom of Great Britain. His legacy includes contributions to both Scottish society and politics.