# Lists of problems

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The following articles contain '''lists of problems'''. This includes unsolved problems, which may refer to several notable [conjectures](/source/List_of_conjectures) or [open problem](/source/open_problem)s in various academic fields:

==Natural sciences, engineering and medicine==
* [List of unsolved problems in astronomy](/source/List_of_unsolved_problems_in_astronomy)
* [List of unsolved problems in biology](/source/List_of_unsolved_problems_in_biology)
* [List of unsolved problems in chemistry](/source/List_of_unsolved_problems_in_chemistry)
* [List of unsolved problems in geoscience](/source/List_of_unsolved_problems_in_geoscience)
* [Unsolved problems in medicine](/source/Unsolved_problems_in_medicine)
* [List of unsolved problems in neuroscience](/source/List_of_unsolved_problems_in_neuroscience)
* [List of unsolved problems in physics](/source/List_of_unsolved_problems_in_physics)

==Mathematics==
* [List of unsolved problems in mathematics](/source/List_of_unsolved_problems_in_mathematics)
* [List of undecidable problems](/source/List_of_undecidable_problems)
* [List of NP-complete problems](/source/List_of_NP-complete_problems)
* [List of PSPACE-complete problems](/source/List_of_PSPACE-complete_problems)
* [List of problems in loop theory and quasigroup theory](/source/List_of_problems_in_loop_theory_and_quasigroup_theory)

== Social sciences, statistics, and information sciences ==
* [List of unsolved problems in economics](/source/List_of_unsolved_problems_in_economics)
* [List of unsolved problems in fair division](/source/List_of_unsolved_problems_in_fair_division)
* [List of unsolved problems in statistics](/source/List_of_unsolved_problems_in_statistics)
* [List of unsolved problems in computer science](/source/List_of_unsolved_problems_in_computer_science)
* [List of unsolved problems in information theory](/source/List_of_unsolved_problems_in_information_theory)

==Other==
* [List of philosophical problems](/source/List_of_philosophical_problems)
* [List of unsolved deaths](/source/List_of_unsolved_deaths)
==See also==
* [Cold case](/source/Cold_case)
* [List of ciphertexts](/source/List_of_ciphertexts)
* [List of hypothetical technologies](/source/List_of_hypothetical_technologies)
* [List of paradoxes](/source/List_of_paradoxes)
* [Unknowability](/source/Unknowability)

{{unsolved problems}}
{{list of lists|science}}

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Category:Lists of unsolved problems
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Category:Science-related lists
Category:Lists of problems
Category:Engineering

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Adapted from the Wikipedia article [Lists of problems](https://en.wikipedia.org/wiki/Lists_of_problems) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Lists_of_problems?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.