Kellogg College is a graduate-only constituent college of the University of Oxford in England. Founded in 1990 as Rewley House, Kellogg is the university's 36th college and the largest by number of students both full and part-time. Named for the Kellogg Foundation, as benefactor, the college hosts research centres including the Institute of Population Ageing and the Centre for Creative Writing. It is closely identified with lifelong learning at Oxford.

The University of Oxford has thirty-nine colleges, and four permanent private halls (PPHs) of religious foundation. Colleges and PPHs are autonomous self-governing corporations within the university. These colleges are not only houses of residence, but have substantial responsibility for teaching undergraduate students. Generally tutorials and classes are the responsibility of colleges, while lectures, examinations, laboratories, and the central library are run by the university. Students normally have most of their tutorials in their own college, but often have a couple of modules taught at other colleges or even at faculties and departments. Most colleges take both graduates and undergraduates, but several are for graduates only.