Guillermo de la Dehesa Romero (born July 9, 1941 in Madrid) is a Spanish lawyer, economist, politician and businessman.

After passing the Técnico Comercial y Economista del Estado in 1968, de la Dehesa held various positions in the central government, in both the ministries of commerce, energy, industry and economics and the Bank of Spain.

De la Dehesa joined the private sector in 1988, serving as Chief Executive Officer of Banco Pastor, President of Gas Madrid, and Consultant to Ibersuizas, Unión Fenosa and Telepizza.

De la Dehesa is currently an international advisor to Goldman Sachs, Vice President of Amadeus IT Group, Non-Executive Chairman of Aviva Corporation, Member of the European Advisory Board of Eli Lilly and Company and an Independent Director and Member of the Executive Committee of Banco Santander.

De la Dehesa is a regular contributor to the newspaper El País and an author of several textbooks on economics.