Class J: Political science is a classification used by the Library of Congress classification system. This article outlines the subclasses of Class J.
| G | General legislative and executive papers |
| JA | Political science (General) |
| JC | Political theory |
| JF | Political institutions and public administration - General |
| JK | Political institutions and public administration - United States |
| JL | Political institutions and public administration - Canada, West Indies, Mexico, Central and South America |
| JN | Political institutions and public administration - Europe |
| JQ | Political institutions and public administration - Asia, Arab countries, Islamic countries, Africa, Atlantic Ocean Islands, Australia, New Zealand, Pacific Ocean Islands |
| JS | Local government. Municipal government |
| JV | colonies and colonization, Emigration and Immigration. International migration |
| JX | International law, (obsolete sub-class) see KZ |
| JZ | International relations |
