Owing largely to the impetus of Professor Chisholm's writings, the topic of Intentionality has come to occupy a prominent place in current work in the philosophy of mind and the philosophy of psychology. The aim of this paper is threefold: (i) briefly to characterize the topic — the Intentionality of thought — and the associated philosophical problems; (ii) to survey Chisholm's contributions to the issue; and (iii) to offer a critical assessment of Chisholm's position in the context of some of its major contemporary rivals.