Double acute accent is a diacritic mark used in written Hungarian.

Hungarian has seven short vowels (a, e, i, o, u, ö, ü) including the front rounded vowels ö and ü. The long equivalents of the first five are written with the acute accent (á, é , í, ó, ú). (The accented a and e is not really just a longer version but articulated differently.)

The double acute acts as combined acute with umlaut, giving the longer version of ö and ü.

The codes are supported in the ISO 8859-2 and UTF-8 codepages, the letters are:

ő	ő	U0151	Latin small letter o with double acute
ű	ű	U0171	Latin small letter u with double acute
Ő	Ő	U0150	Latin capital letter o with double acute
Ű	Ű	U0170	Latin capital letter u with double acute