Thomas Clap or Thomas Clapp (June 26, 1703 – January 7, 1767) was an American academic and educator, a Congregational minister, and college administrator. He was both the fifth rector and the earliest official to be called "president" of Yale College (1740–1766). He is best known for his successful reform of Yale in the 1740s, partnering with the Rev. Dr. Samuel Johnson to restructure the forty-year-old institution along more modern lines. He convinced the Connecticut Assembly to exempt Yale from paying taxes. He opened a second college house and doubled the size of the college; Yale graduated more students than Harvard beginning in 1756. He introduced Enlightenment math and science and Johnson's moral philosophy into the curriculum, while retaining its Puritan theology. He also helped found the Linonian Society in 1753, a literary and debating society and one of Yale's oldest secret societies. He personally built the first Orrery in America, a milestone of American science, and awarded his friend Benjamin Franklin an honorary degree.