This is a list of topics that have, either currently or in the past, been characterized as pseudoscience by academics or researchers. Detailed discussion of these topics may be found on their main pages. These characterizations were made in the context of educating the public about questionable or potentially fraudulent or dangerous claims and practices, efforts to define the nature of science, or humorous parodies of poor scientific reasoning. Criticism of pseudoscience, generally by the scientific community or skeptical organizations, involves critiques of the logical, methodological, or rhetorical bases of the topic in question. Though some of the listed topics continue to be investigated scientifically, others were only subject to scientific research in the past and today are considered refuted, but resurrected in a pseudoscientific fashion. Other ideas presented here are entirely non-scientific, but have in one way or another impinged on scientific domains or practices. Many adherents or practitioners of the topics listed here dispute their characterization as pseudoscience. Each section here summarizes the alleged pseudoscientific aspects of that topic.

Physical sciences

Astronomy and space sciences

Earth sciences

Physics

Applied sciences

Agriculture

Architecture

Finance

Health and medicine

Pseudoscientific medical practices are often known as quackery. In contrast, modern medicine is (or seeks to be) evidence-based.

Technology

Social sciences

History

Linguistics

Psychology

Racial theories

Sociology

Paranormal and ufology

Paranormal subjects have been critiqued from a wide range of sources including the following claims of paranormal significance:

Numerology

Religious and spiritual beliefs

Spiritual and religious practices and beliefs, according to astronomer Carl Sagan, are normally not classified as pseudoscience. However, religion can sometimes nurture pseudoscience, and "at the extremes it is difficult to distinguish pseudoscience from rigid, doctrinaire religion", and some religions might be confused with pseudoscience, such as traditional meditation. The following religious/spiritual items have been related to or classified as pseudoscience in some way:

Creation science

Creation science or scientific creationism is a branch of creationism that claims to provide scientific support for the Genesis creation narrative in the Book of Genesis and disprove or reexplain the scientific facts, theories and scientific paradigms about geology, cosmology, biological evolution, archaeology, history and linguistics.

Scientology

Other

Idiosyncratic ideas

The following concepts have only a very small number of proponents, yet have become notable: