Walden C. “Wally” Rhines (born November 11, 1946) is an American engineer and businessman. Rhines is President and CEO of Cornami, Inc., a fabless semiconductor company focused on fully homomorphic encryption. Previously, he was President and CEO of Mentor Graphics, a Siemens Business for 23 years and Executive VP of the Semiconductor Group of Texas Instruments for 21 years. Rhines was named overall CEO of the Year by Portland Business Journal in 2012 and Oregon Technology Executive of the Year by the Technology Association of Oregon in 2003. He was named an IEEE Fellow in 2017.