Tieman H. Dippel Jr. (born 1945) is an American civic leader, businessman, attorney, and author. He has served in the University of Texas system, the Texas Chamber of Commerce, Blue Cross Blue Shield, as director in the Federal Reserve Bank of Dallas, and many other institutions; in addition to founding the Texas Lyceum. He is known for his book series and philosophic concept, The Language of Conscience, published between 1987 and 2012.