A philosophical branch is a broad division of the overall subject. A philosophical doctrine is a particular theory, principle, position, system, code of beliefs or body of teachings. These are the famous “-isms” of Philosophy.

Within each branch, there are any number of related, similar or opposing doctrines covering different aspects of the whole, although many doctrines overlap with, and may have repercussions in, more than one branch of Philosophy. The distinction between philosophical doctines or theories, and the various movements or schools of philosophy is sometimes blurred.

Philosophy as a whole is traditionally split into four or more main branches. The main four are:

In addition to these, two more branches are often added:

In addition to these, there are other branches concerned with philosophical questions arising from other disciplines, including:

Many others could be added to this list such as Philosophy of Law, Philosophy of Sociology, Philosophy of Mathematics, Philosophy of Ethnology (also known as Ethnophilosophy), Philosophy of Psychology, even Philosophy of Philosophy (also known as Meta-Philosophy).