BGN/PCGN Romanization systems
The U.S. Board on Geographic Names and the Permanent Committee on Geographical Names jointly maintain the set of "BGN/PCGN romanization systems", a set of script conversion systems widely relied upon for geographic name script conversions.
Systems listed here are ordered according to the "Introduction to Romanization Systems and Roman script spelling conventions (updated 25 September 2020)" document, available at BGN and PCGN.
NOTE: The title of a language or a writing system is followed by a note on the Romanization system used.