The following articles contain lists of notable problems. This includes unsolved problems, which may refer to several notable conjectures or open problems in various academic fields:
Natural sciences and medicine List of unsolved problems in astronomy List of unsolved problems in biology List of unsolved problems in chemistry List of unsolved problems in geoscience Unsolved problems in medicine List of unsolved problems in neuroscience List of unsolved problems in physics
Mathematics List of unsolved problems in mathematics List of undecidable problems List of NP-complete problems List of PSPACE-complete problems List of problems in loop theory and quasigroup theory
Social sciences, statistics, and information sciences List of unsolved problems in economics List of unsolved problems in fair division List of unsolved problems in statistics List of unsolved problems in computer science List of unsolved problems in information theory
Other List of philosophical problems List of unsolved deaths
See also Cold case List of ciphertexts List of hypothetical technologies List of paradoxes Unknowability