I
- Iceland
- Icelandic
- Icelandic Sign Language
- India (Languages with official status in India)
- English (statewide)
- Hindi (Central Government, ten states, and Delhi, Chandigarh and Andaman and Nicobar Islands)
- Assamese (in Assam)
- Bengali (in Tripura, Andaman and Nicobar Islands, parts of Assam and West Bengal)
- Bodo (in Assam)
- Chhattisgarhi (in Chhattisgarh)
- Dogri (in Jammu and Kashmir)
- French (in Pondicherry)
- Garo (in Meghalaya)
- Gujarati (in Dadra and Nagar Haveli, Daman and Diu, and Gujarat)
- Kannada (in Karnataka)
- Karbi (in Assam)
- Kashmiri (in Jammu and Kashmir)
- Khasi (in Meghalaya)
- Kokborok (in Tripura)
- Konkani (in Goa and Mangalore)
- Maithili (mentioned on the 8th schedule but no region specified, spoken in Bihar)
- Malayalam (in Kerala and Pondicherry)
- Meitei (in Manipur)
- Marathi (in Maharashtra, Goa, Dadra and Nagar Haveli, Daman and Diu)
- Mizo (in Mizoram)
- Nepali (in Sikkim)
- Nicobarese (in Andaman and Nicobar Islands)
- Oriya (in Orissa)
- Punjabi (in Punjab, Himachal pradesh, Haryana and Chandigarh)
- Sanskrit (in Uttarakhand)
- Santali (in Jharkhand)
- Sindhi (not regionally specified)
- Tamil (in Tamil Nadu, Kerala, Andaman and Nicobar Islands, Andhra Pradesh, Karnataka and Pondicherry)
- Telugu (in Andhra Pradesh and Pondicherry)
- Indonesia (Languages of Indonesia)
- Indonesian (national and official)
- Acehnese (in Aceh)
- Batak (in North Sumatra)
- Minangkabau (in West Sumatra)
- Javanese (in Central Java, Yogyakarta and East Java)
- Buginese (in South Sulawesi)
- Banjar (in South Kalimantan)
- Malay (in Riau, Jambi, West Kalimantan)
- Sundanese (in Banten and West Java)
- Balinese (in Bali)
- Betawi (in Jakarta)
- Madurese (in Madura)
- Iran
- Persian
- Iraq
- Arabic (statewide)
- Kurdish (statewide)
- Assyrian Neo-Aramaic (in assyrian areas)
- Iraqi Turkmen (in Turkmen areas)
- Ireland (Languages of Ireland)
- English (national)spoken by the 99% of the population
- Irish (national) spoken by the 0.5% of the population
- Israel
- Hebrew (de facto official)
- Arabic (co-official)
- Italy (Languages of Italy)
- Italian (statewide)
- Albanian (in some parts of Southern Italy)
- Catalan (in Alghero, Sardinia)
- Croatian (in Montemitro & Acquaviva Collecroce & San Felice, Molise)
- French (in Aosta Valley)
- Friulian (in Friuli)
- German (in South Tyrol)
- Greek (in some parts of Apulia and Calabria)
- Ladin (in some parts of Belluno, Veneto and Trentino-Alto Adige/Südtirol)
- Sardinian (in Sardinia)
- Sicilian (in Sicily)
- Slovene (in some parts of Friuli-Venezia Giulia)
- Venetian (in Veneto)
Read more about this topic: List Of Official Languages By State