William Carlton Eacho III (born 1954) is the former United States Ambassador to Austria. Eacho was nominated by President Barack Obama in June 2009. He was confirmed by the US Senate and sworn in during August 2009. He succeeded David F. Girard-diCarlo as ambassador in 2009 and was succeeded by Alexa Wesner in September 2013. Eacho presently is a co-founder of The Partnership For Responsible Growth, a bipartisan organization advocating for US legislation for a fee on carbon extraction to counter the climate change threat.