What is the twenty-third letter of the Latin alphabet?

I see what you did there, OP.

Yes, the 23rd letter of the Latin alphabet depends on which version of the Latin alphabet you’re using: there’s no universal 23rd letter, because there’s no universal repertoire of Latin letters. Some languages have fewer letters than English. Some have more letters than English. Some languages count letters with diacritics as distinct letters. Some languages count digraphs as distinct letters as well.

In English, it’s W. In Latin, it’s Z. In Turkish, it’s Ş. In Spanish up to 2010 (which counted <ll> and <ch> as separate letters), it was T. In Albanian, it’s Q.