This study investigates the relation between compensation consultants and CEO pay using a unique data set of over 200 publicly traded UK firms. We present theoretical arguments that compensation consultants (who are experts in the market for compensation services) promote pay contracts to align managerial and shareholder interests. Empirically we show that CEO pay is greater in firms using large consultants, namely consultants with a greater number of clients. There are other important contingencies. We find that CEO pay is greater in firms whose compensation consultants supply other services to the client firm. We also find CEO pay is greater the higher is the average CEO pay of the consultants other clients. To explain this phenomenon we draw on two other theoretical paradigms --managerial power and social comparison theory. Overall, the evidence provides consistent support for our hypotheses. We argue that the results have important implications for executive pay scholars, as well as for the designers of compensation packages. (JEL G31, G34, M41)