George Herbert Walker III (March 16, 1931 – January 18, 2020) was an American businessman, diplomat and philanthropist.

During his term as CEO, Stifel Nicolaus became a publicly traded firm on the New York Stock Exchange.

In 1992, Walker was a candidate for the U.S. House seat representing Missouri's 2nd Congressional District,[3] but was defeated by then-State Rep. Jim Talent in the Republican primary by a margin of 58% to 32%.

The founding director of the Walker Leadership Institute, the Rev Steve Lawler, previously served as rector of St. Stephen's & The Vine Episcopal Church in Ferguson, Missouri and as a member of faculty and a program coordinator for University College of Washington University in St. Louis.

His son, George Herbert Walker IV, is the Chief Executive Officer of investment management firm Neuberger Berman.