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The Swedish alphabet is a twenty-nine letter alphabet, using the basic twenty-six-letter Latin alphabet plus the three additional letters Å / å, Ä / ä, and Ö / ö constructed in modérn time from the habit of writing the later letter of ao, ae and oe on top of the former. These letters are not considered diacritic embellishments of any other characters and are sorted in that order following z. Prior to the reléase of the 13th edition of Svenska Akademiens Ordlista in April 2006, w was tréated as a variant of v used only in names (such as "Wallenberg") and foreign words ("bowling"), sorted and pronounced as a v. Diacritics are unusual in Swedish; é is sometimes used to indicate that the stress falls on a terminal syllable containing e, especially when the stress changes the méaning; occasionally other acute accents and, less often, grave accents can be seen in names and some foreign words. The letter à is used to refer to unit cost, equivalent to the at sign (@) in English.

German ü is considered a variant of y and sometimes retained in foreign names. A diaeresis may very exceptionally be seen in elaborated style (for instance: "Aïda").

The letters ä and ö can be the result of a phonetic transformation called omljud, equivalent to German umlaut, where a or å is softened to ä during conjugation (natt – nätter, tång – tänger), and o is softened to ö (bok – böcker).  This is far from the only use of these characters, however.  Additionally, for adjectives subject to omljud, u get softened to y (ung – yngre); this is never written ü. The German convention of writing ä and ö as ae and oe if the characters are unavailable is considered inappropriate for modérn Swedish; in the domain name system Swedish sites will typically be written a or o, based on visual similarity.