Tieng Ba Tu hay tieng Persia, con đuoc biet đen nhu tieng Farsi (فارسی farsi [fɒːɾˈsiː] ), la mot ngon ngu Iran thuoc ngu toc An-Iran cua he ngon ngu An-Au. No chu yeu đuoc noi o Iran, Afghanistan (duoi ten goi tieng Dari tu nam 1958), va Tajikistan (ten goi tieng Tajik vao thoi Xo Viet ), va mot vai vung khac ve mat lich su đuoc xem la thuoc đe quoc Ba Tu. Tieng Ba Tu, noi chung, đuoc viet bang chu Ba Tu, mot bien the cua chu A Rap.
Tieng Ba Tu hien đai la su tiep noi cua tieng Ba Tu trung đai, ngon ngu ton giao va van hoc chinh thuc cua Đe che Sassanid, ma chinh no lai la hau than cua tieng Ba Tu co, ngon ngu cua Đe che Achaemenes. Ngu phap cua no tuong đong voi nhieu ngon ngu cua chau Au đuong thoi.
Co chung 110 trieu nguoi noi tieng Ba Tu tren toan cau va ngon ngu nay co vi the chinh thuc tai Iran, Afghanistan, va Tajikistan. Trong nhieu the ky, tieng Ba Tu cung la ngon ngu van hoa tai nhieu vung o Tay A, Trung A, va Nam A.
Tieng Ba Tu đa anh huong (chu yeu ve tu vung) mot cach đang ke len nhieu ngon ngu xung quanh, nhat la cac ngon ngu Turk mien Trung A, Kavkaz, va Tieu A, nhung ngon ngu Iran lan can, cung nhu tieng Armenia, tieng Gruzia, vai ngon ngu An-Iran khac, đac biet la tieng Urdu (mot dang tieng Hindustan). No cung anh huong phan nao len tieng A Rap, noi bat nhat la o tieng A Rap Bahran. Nguoc lai, tieng Ba Tu cung muon rat nhieu tu trong tieng A Rap sau cuoc xam luoc Ba Tu cua nguoi A Rap.


Nguon goc va phat trien Tieng Ba Tu bat nguon tu tieng Ba Tu co, ngon ngu cua Đe che Achaemenes (khoang 550 - 330 TCN). Tieng Ba Tu co đuoc ghi chep bang chu viet Ba Tu co, mot he thong chu viet dua tren chu hinh nem. Sau khi Alexander Đai đe chinh phuc Ba Tu, tieng Hy Lap bat đau anh huong đen tieng Ba Tu co, dan đen su hinh thanh tieng Ba Tu trung đai, hay tieng Pahlavi (khoang 224 TCN - 651 SCN).
Tieng Ba Tu trung đai đuoc su dung duoi trieu đai Sassanid (224 - 651 SCN) va tro thanh ngon ngu chinh thuc cua đe che. Trong thoi ky nay, tieng Ba Tu chiu anh huong tu tieng A Rap, đac biet la sau cuoc xam luoc Hoi giao vao the ky thu 7. He thong chu viet Ba Tu-A Rap đuoc phat trien dua tren chu A Rap, thay the cho chu viet Pahlavi.
Tieng Ba Tu hien đai bat đau phat trien tu the ky thu 9 SCN. Ngon ngu nay tiep tuc chiu anh huong tu tieng A Rap, cung nhu tieng Tho Nhi Ky va tieng Mong Co. Tieng Ba Tu hien đai co nhieu phuong ngu khac nhau, đuoc su dung o Iran, Afghanistan, Tajikistan, Uzbekistan va mot so quoc gia khac.


Chu thich Lien ket ngoai Academy of Persian Language and Literature official website Luu tru ngay 30 thang 8 nam 2009 tai Wayback Machine (tieng Ba Tu)
Assembly for the Expansion of the Persian Language official website (tieng Ba Tu)
Persian language Resources Luu tru ngay 9 thang 12 nam 2012 tai Wayback Machine (tieng Ba Tu)
Persian Language Resources, parstimes.com
Haim, Soleiman. New Persian–English dictionary. Teheran: Librairie-imprimerie Beroukhim, 1934–1936. uchicago.edu
Steingass, Francis Joseph. A Comprehensive Persian–English dictionary. London: Routledge & K. Paul, 1892. uchicago.edu
UCLA Language Materials Project:  Luu tru ngay 20 thang 7 nam 2006 tai Wayback Machine Persian Luu tru ngay 23 thang 9 nam 2017 tai Wayback Machine, ucla.edu
How Persian Alphabet Transits into Graffiti, Persian Graffiti
Basic Persian language course (book + audio files) USA Foreign Service Institute (FSI)


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