---
title: "Lists of problems"
chunk: 1/1
source: "https://en.wikipedia.org/wiki/Lists_of_problems"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T03:29:50.990677+00:00"
instance: "kb-cron"
---

The following articles contain lists of problems. This includes unsolved problems, which may refer to several notable conjectures or open problems in various academic fields:


== Natural sciences, engineering 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