You usually find a collection of reference tables in the back of dictionaries, almanacs, and encyclopedias (or an index of them, if they're scattered throughout the work). As these tables appear in Wikipedia, please add them to this index.
What we have in mind is listings or tabular information for quick reference, not narrative articles.
Astronomy
Biology
Medicine
Chemistry
Geography
Geology
Mathematics
Physics
Size, Measurement and Conversions
Standards
Computing and the Internet
Banking and Finance
Events and History
- Historical timeline of centuries, decades and years
- Historical anniversaries
- List of timelines
- Inventions
- List of battles
- List of wars
- Major cases of genocide and democide
- List of terrorist groups
- List of terrorist incidents
- List of guerrilla movements
- List of guerrillas
- Extinct countries, empires, etc.
People (rulers)
People (professions)
- Other Professions
People (not as rulers)
- Biographies
- Biblical figures
- Saints
- Nobel Prize winners: Physics, Chemistry, Medicine, Literature, Peace, Economics
- Famous gay lesbian or bisexual people
- Listing of noted atheists
- Listing of noted agnostics
- Listing of noted Buddhists
- Listing of noted Deists
- Listing of noted Hindus
- Recent celebrity deaths