Long I or I with macron (Ӣ ӣ; italics: Ӣ ӣ) is a letter of the Cyrillic script. In Tajik, it represents a stressed close front unrounded vowel /i/ at the end of a word. In Kildin Sami on the Kola Peninsula and Mansi in western Siberia, it represents long /iː/. Both these sounds are pronounced like the ee in “feet”. In those languages, vowel length is distinctive, and the macron marks the long version of vowels.

I with macron is also used in Aleut (Bering dialect). It is the sixteenth letter of the modern Aleut alphabet. It looks similar to the Short I (Й й Й й) and often written identically in some cursive scripts. It is also used to substitute this letter in some fonts.

I with macron also appears in the Bulgarian and Serbian languages.

I with macron is used in some of the South Slavic languages, mainly Bulgarian and Serbian for two-syllable offset based on the old Slavic accent law, to become easy for the accent analogy to pass in separate words, to become lexical. as the analogy passed through three-syllable oxytones with a tonal pattern: тетӣвà. I with macron is also sometimes used as a form of Short I.