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====Celtic====
:* [[Welsh language|Welsh]] uses the circumflex, diaeresis, acute, and grave accents on its seven vowels ''{{angbr|a}}, {{angbr|e}}, {{angbr|i}}, {{angbr|o}}, {{angbr|u}}, {{angbr|w}}, {{angbr|y''}} (hence the composites {{angbr|â}}, {{angbr|ê}}, {{angbr|î}}, {{angbr|ô}}, {{angbr|û}}, {{angbr|ŵ}}, {{angbr|ŷ}}, {{angbr|ä}}, {{angbr|ë}}, {{angbr|ï}}, {{angbr|ö}}, {{angbr|ü}}, {{angbr|ẅ}}, {{angbr|ÿ}}, {{angbr|á}}, {{angbr|é}}, {{angbr|í}}, {{angbr|ó}}, {{angbr|ú}}, {{angbr|ẃ}}, {{angbr|ý}}, {{angbr|à}}, {{angbr|è}}, {{angbr|ì}}, {{angbr|ò}}, {{angbr|ù}}, {{angbr|ẁ}}, {{angbr|ỳ}}). However all except the circumflex (which is used as a macron) are fairly rare.
:* Following spelling reforms since the 1970s, [[Scottish Gaelic]] uses graves only, which can be used on any vowel (''{{angbr|[[à]]}}, {{angbr|[[è]]}}, {{angbr|[[ì]]}}, {{angbr|[[ò]]}}, {{angbr|[[ù]]''}}). Formerly acute accents could be used on ''{{angbr|á}}, {{angbr|ó''}} and ''{{angbr|é''}}, which were used to indicate a specific vowel quality. With the elimination of these accents, the new orthography relies on the reader having prior knowledge of pronunciation of a given word.
:* [[Manx language|Manx]] uses the singlecedilla diacritic {{angbr|[[ç]]}} combined with h to give the digraph {{angle bracket|çh}} (pronounced {{IPA|/tʃ/}}) to mark the distinction between it and the digraph {{angle bracket|ch}} (pronounced {{IPA|/h/}} or {{IPA|/x/}}). Other diacritics used in Manx included the circumflex and diaeresis, as in {{angbr|â}}, {{angbr|ê}}, {{angbr|ï}}, etc. to mark the distinction between two similarly spelled words but with slightly differing pronunciation.
:* [[Irish language|Irish]] uses only acute accents to mark long vowels, following the 1948 spelling reform. [[Lenition]] is indicated using an [[overdot]] in [[Gaelic type]]:; in [[Roman type]], a suffixed {{angbr|h}} is used. Thus, <span style="font-family:Duibhlinn, Ceanannas, Corcaigh, sans-serif">{{lang|gv|a ṁáṫair}}</span> is equivalent to <span style="font-family:Times New Roman, serif">{{lang|gv|a mháthair}}</span>.
:* [[Breton orthography|Breton]] does not have a single orthography (spelling system), but uses diacritics for a number of purposes. The diaeresis is used to mark that two vowels are pronounced separately and not as a diphthong/digraph. The circumflex is used to mark long vowels, but usually only when the vowel length is not predictable by phonology. Nasalization of vowels may be marked with a tilde, or following the vowel with the letter <{{angbr|ñ>}}. The plural suffix -où is used as a unified spelling to represent a suffix with a number of pronunciations in different dialects, and to distinguish this suffix from the digraph <{{angbr|ou>}} which is pronounced as {{IPA|/u:/}}. An apostrophe is used to distinguish {{angbr|c'h}}, pronounced {{IPA|/x/}} as the digraph <{{angbr|ch>}} is used in other Celtic languages, from the French-influenced digraph ch, pronounced {{IPA|/ʃ/}}.
====Finno-Ugric====
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