Geografi (juga dikenali sebagai Geographia, Cosmographia, atau Geographike Hyphegesis) merupakan kerja utama Ptolemy selain Almagest. Ia adalah risalah mengenai kartografi dan himpunan apa yang diketahui mengenai dunia yang geografiEmpayar Rom pada abad ke-2.
Ptolemy terutamanya bergantung kepada kerja-kerja geografi yang lebih awal, Marinos Tirus, dan gazetir Rom dan kuno Empayar Parsi.[1]
J. L. Berggren, Alexander Jones; Ptolemy's Geography By Ptolemy, Princeton University Press, 2001 ISBN 0-691-09259-1
Berggren, J. Lennart and Jones, Alexander. 2000. Ptolemy's Geography: An Annotated Translation of the Theoretical Chapters. Princeton University Press. Princeton and Oxford. ISBN 0-691-01042-0.
Cosgrove, Dennis. 2003. Apollo's Eye: A Cartographic Genealogy of the Earth in the Western Imagination. Johns Hopkins University Press. Baltimore and London.
Stevenson, Edward Luther. Trans. and ed. 1932. Claudius Ptolemy: The Geography. New York Public Library. Reprint: Dover, 1991. This is the only complete English translation of Ptolemy's most famous work. Unfortunately, it is marred by numerous mistakes (see Diller) and the place names are given in Latinised forms, rather than in the original Greek.