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The dotted i (І і; italics: І і), also called decimal i (и десятеричное, after its former numeric value) or soft dotted i, is a letter of the Cyrillic script. It commonly represents the close front unrounded vowel , like the pronunciation of ⟨i⟩ in English "machine". It is used in the orthographies of Belarusian, Kazakh, Khakas, Komi, Carpathian Rusyn and Ukrainian and quite often, but not always, is the equivalent of the Cyrillic letter i (И и) as used in Russian and other languages. However, the letter І was also used in Russian before the Bolshevik reform of 1918. In Ukrainian, І is the twelfth letter of the alphabet and represents the sound [i] in writing. Ukrainian uses и to represent the sound [ɪ]. In Belarusian, I is the tenth letter of the alphabet. It represents [i]. The two Carpathian Rusyn standard varieties use і, и and ы for three different sounds: , and , respectively. In Komi, і occurs only after the consonants д, з, л, н, с, and т and does not palatalize them, while и does. In Kazakh and Khakas, і represents , as in "bit". Just like the Latin letters I/i (and J/j), the dot above the letter appears only in its lowercase form and then only if that letter is not combined with a diacritic above it (notably the diaeresis, used in Ukrainian to note the letter yi of its alphabet, and the macron). Even when the lowercase form is present without any other diacritic, the dot is not always rendered in historic texts (the same historically applied to the Roman letters i and j). Some modern texts and font styles, except for cursive styles, still discard the "soft" dot on the lowercase letter, because the text is readable without it. However, the current official rules of Belarusian orthography (2008) state that the letter is undotted in printed uppercase, but should be dotted in lowercase and in handwritten uppercase.

The Cyrillic soft dotted letter i was derived from the Greek letter iota (Ι ι). The dot came later with some typefaces through Western European influence, which similarly affected other Cyrillic letters such as а and е. The name of this letter in the Early Cyrillic alphabet was (i), meaning "and". In the Cyrillic numeral system, soft dotted І had a value of 10. In the early Cyrillic alphabet, there was little or no distinction between the Cyrillic letter i (И и), derived from the Greek letter eta, and the soft dotted letter i. They both remained in the alphabetical repertoire, since they represented different numbers in the Cyrillic numeral system, eight and ten, respectively. They are, therefore, sometimes referred to as octal I and decimal I.

Languages Notes Belarusian, Kazakh, Khakas, Komi, Carpathian Rusyn, Ukrainian In current use. In Kazakh, ⟨i⟩ is for native [ɘ], but in foreign words it is instead written as <и>. Macedonian Either this letter or the letter ⟨Й⟩ was used by Macedonian authors to represent the sound /j/ until the introduction of the letter ⟨Ј⟩. Russian In use until 1918, when the Bolsheviks significantly altered the Russian orthography; groups opposed to the Bolsheviks continued to use the letter for decades thereafter. Bulgarian In use until 1878. Ossetian In use until 1923.

⟨і⟩ was used before all vowels and before the semivowel ⟨й⟩ except at the end of a morpheme in a compound word, where ⟨и⟩ was used. So англійскій (English) used ⟨і⟩, but пяти + акровый = пятиакровый (five acre) used ⟨и⟩. ⟨и⟩ was used as the last letter of a word and before consonants except in міръ for "world, universe, local community, commons, society, laity" (and words derived from it) to differentiate from миръ "peace"). After 1918, both are spelled мир. In a few words derived from Greek, use was derived etymologically based upon whether iota or eta was in the original Greek: Іисусъ "Jesus", from Greek Ιησούς, now written Иисус; also Іванъ from Ἰωάννης, now written Иван. However, since the middle of the 18th century loanwords came to be spelled according to the general rule: Іоаннъ but Иванъ, Никита (instead of Нiкита), Филиппъ (instead of Фiлiппъ). According to critics of the Bolshevik reform, the choice of Ии as the only letter to represent that side and the removal of Іі defeated the purpose of 'simplifying’ the language, as Ии occupies more space and, furthermore, is sometimes indistinguishable from Шш. The reform also created many homographs and homonyms, which used to be spelled differently. Examples: есть/ѣсть (to be/eat) and миръ/міръ (peace/the Universe) became есть and мир in both instances.

In Macedonian, this letter, or the letter Й, was used by Macedonian authors to represent the sound /j/ until the introduction of the letter Ј. In Bulgarian the letter was used until 1878, while in Ossetian it was used until 1923. This letter is currently in use in Belarusian, Kazakh, Khakas, Komi, Carpathian Rusyn and Ukrainian, where it reprsents the sound /i/. It is the tenth letter in Belarussian, the twelfth in Carpathian Rusyn and Ukrainian, the thirty eighth in Kazakh and the eleventh in Komi.