ABSTRACT Between April 1820 and April 1822, stimulated by the restoration of the Cádiz Constitution, Bentham devoted himself to writing a number of works on the constitutional reform and colonial rule of Spain, which have been sources of a scholarly debate over Bentham's views on colony. By examining those works, this essay aims to supplement the scholarly debate by drawing attention to a thesis that Bentham developed in his criticism and evaluation of the Cádiz Constitution: a thesis concerning the irreconcilable (...) incompatibilities of liberal constitution and colonisation. I focus on Bentham's critical analyses of the Constitution, and indicate that Spain's colonial rule of Ultramaria not only intensified the weaknesses of the Constitution, but also rendered its merits useless, if not harmful, to the public in both hemispheres. Moreover, I explore the tension that Bentham detected between liberal constitutionalism and colonialism. I maintain that, in Bentham's observation, the civil rights granted by the Cádiz Constitution to the Ultramarians stood to facilitate the enlightenment of citizens and the formation of civil society. As a consequence, the delusion of the Spanish ruling few would be exposed, and the Ultramarians’ discontent with exploitation by such foreign rulers would sow the seeds of disobedience and resistance. (shrink)