This is a list of lists of unsolved problems in various subjects:

• Unsolved problems in biology
• Unsolved problems in chemistry
• Unsolved problems in cognitive science
• List of open problems in computer science
• Unsolved problems in economics
• Unsolved problems in governance
• Unsolved problems in mathematics
• Unsolved problems in medicine
• Unsolved problems in neuroscience
• Unsolved problems in philosophy
• Unsolved problems in physics (incl. astrophysics)
• Unsolved problems in religion
• Unsolved problems in software engineering

External links

• New York Times article on leading unsolved questions in science