Not for all languages. For example, I'm Bulgarian and there is no way to transliterate the letter "ъ". Our official latinisation rules (since we need to write e

Not for all languages. For example, I'm Bulgarian and there is no way to transliterate the letter "ъ". Our official latinisation rules (since we need to write e.g. our names in latin characters for international passports etc.) say to use "a", but that's just a close approximation. It's even in the name of the country - България, where it's transliterated as a "u", as that gets the sound across more or less. The fact is, Latin has 5 vowels and Bulgarian has 6, so there is pretty much no way to correctly transliterate Bulgarian into Latin unless we invent some new 6th vowel for the schwa sound. Also the fact that we have letters for "sh", "ch", "zh", "sht", "tz", which we can't write as the digraphs, because we also have words where the individual sounds occur in sequence, i.e. the "s" sound followed by the "h" sound, so "sh" is ambiguous. None of these problems can be solved by diacritics, because computers mostly don't understand diacritics and Americans don't understand diacritics, so they just drop them. Even in cases where there is a way to transcribe diacritics, as in the German umlaut, Americans just drop it, instead of writing it as an "e" following the vowel - using "uber" instead of "ueber", "Schrodinger" instead of "Schroedinger" (the latter even being marked wrong by my spell checker!), etc. So I don't see any way to latinise Bulgarian, as the common Latin alphabet simply does not have enough letters, adding more is not an option, and using diacritics will simply lead to them being dropped in information systems.