A measure of individual differences in the motivation to control in-group bias ( favouritism) was created. As in Plant and Devine’s (1998) measure of out-group bias, one subscale referred to an internal motivational source and the other to an external motivational source. The psychometric properties of the measure were tested across four samples. The results indicate that the measure reliably captures individual differences in the motivation to control in-group bias, and that a distinction between internal and external motivational sources of control can be made. However, the convergent and discriminant validity of both subscalesneeds to be examined further before the measure can be considered launchable. Implications for research on intergroup bias are discussed.