Class B: Philosophy, Psychology, Religion is a classification used by the Library of Congress classification system. This article outlines the subclasses of Class B.
| B | Philosophy (General) | |
| BC | Logic | |
| BD | Speculative philosophy | |
| BF | Psychology | |
| BH | Aesthetics | |
| BJ | Ethics | |
| BL | Religions; Mythology; Rationalism | |
| BM | Judaism | |
| BP | Islam; Bahaism; Theosophy | |
| BQ | Buddhism | |
| BR | Christianity | |
| BS | The Bible | |
| BT | Doctrinal Theology | |
| BV | Practical Theology | |
| BX | Christian Denominations |
