This is a list of topics characterized as pseudoscience by organizations within the international scientific community, by notable skeptical organizations, or by notable academics or researchers. Besides explicitly using the word "pseudoscience", some may also have used synonyms that help to explain why they consider a topic to be pseudoscientific. The existence of such expressed opinions suffices for inclusion in this list, and therefore inclusion does not necessarily indicate that any given entry is in fact pseudoscience. Opposing points of view exist and are presented in the main article for each subject listed below. Also included are important concepts associated with the main entries, and concepts that, while notable and self-evidently pseudoscientific, have not elicited commentary from mainstream scientific bodies or skeptical organizations. Notable parodies of pseudoscientific concepts are also included.

Some subjects in this list may be questioned aspects of otherwise legitimate fields of research, or have legitimate ongoing scientific research associated with them. For instance, while some proposed explanations for hypnosis have been criticized for being pseudoscientific, the phenomenon is generally accepted as real and scientific explanations exist. Some subjects and methods are included because certain claims regarding them are pseudoscientific, even though the subjects themselves may be legitimate, or the methods themselves may have some efficacy, thus indicating it is the claims that are pseudoscientific, and not necessarily the subjects or methods.