Ya with diaeresis (Я̈ я̈; italics: Я̈ я̈) is a letter of the Cyrillic script.
Ya with diaeresis is used in the Selkup language.
In Russian, ya with diaeresis saw rare use prior to the 1918 orthography reform to indicate that a stressed letter ya () should be pronounced as instead of the expected , in a similar fashion to the role of yo (). For example, the modern pronouns and were formerly spelled and in the genitive and possessive, due to their historical pronunciations as and , which had since shifted to and . As with the letter yo, use of the diaeresis was rare outside of learning materials and dictionaries, and following the reform the letter was replaced with yo outright.