Tieng Mong Co (chu Mong Co truyen thong:ᠮᠣᠩᠭᠣᠯᠬᠡᠯᠡ; chu Kirin Mong Co:Монгол хэл) la ngon ngu chinh thuc cua Mong Co, va la thanh vien noi bat hon ca cua ngu he Mong Co. So nguoi noi tat ca cac phuong ngu khac nhau len toi hon 5,2 trieu, gom đa phan cu dan o Mong Co va nhieu nguoi Mong Co o Khu tu tri Noi Mong Co.
Tai Mong Co, phuong ngu Khalkha viet bang chu Kirin (va co luc bang chu Latinh tren mang xa hoi) chiem uu the nhat. Tai Noi Mong (Trung Quoc), phuong ngu tieng Mong Co đa dang hon nhieu va dung chu viet Mong Co truyen thong.
Mot so hoc gia coi nhung ngon ngu he Mong Co khac nhu tieng Buryat va tieng Oirat đeu la phuong ngu cua cung mot thu tieng, song cach phan loai nay khong tuong đong voi tieu chuan quoc te hien nay.
Tieng Mong Co co su hai hoa nguyen am va cau truc am tiet phuc tap cho phep nhung nhom ba phu am nam cuoi am tiet hien dien. Đay la mot ngon ngu chap dinh đien hinh, dua tren cac chuoi hau to. Du co thu tu tu co so (chu-tan-đong), su sap xep cum danh tu lai tuong đoi tu do, nen vai tro ngu phap phai đuoc chi ra boi mot he thong gom khoang tam cach ngu phap. Tieng Mong Co co nam thai (voice). Đong tu cho biet dang, the, thi, va tinh thai/bang chung.
Tieng Mong Co hien đai phat trien tu tieng Mong Co trung đai, ngon ngu cua Đe quoc Mong Co vao the ky XIII-XIV. Trong qua trinh phat trien, tieng Mong Co trai qua thoi ky tai cau truc hoa am nguyen am, nguyen am dai phat trien, he thong cach ngu phap bien đoi, va he thong đong tu đuoc tai dung. Tieng Mong Co co lien quan toi tieng Khiet Đan (Khitan). Tieng Mong Co nam trong pham vi anh huong cua sprachbund Altai; cung voi ngu he Turk, ngu he Tungus, ngu he Trieu Tien va ngu he Nhat Ban. Van hoc tieng Mong Co đuoc luu giu tot o dang viet, so huu nhieu van lieu quy gia tu đau the ky XVIII.


Phan bo đia ly Tieng Mong Co la ngon ngu chinh thuc cua Mong Co va đuoc noi boi 3,6 trieu nguoi trong nuoc (uoc tinh nam 2014), va la ngon ngu tinh chinh thuc cua khu tu tri Noi Mong Co voi tam 4,1 trieu nguoi Mong Co. Khoang mot nua trong so 5,8 dan Mong Co tren khap Trung Quoc noi ngon ngu nay (uoc tinh nam 2005) Tuy nhien, ta khong biet chinh xac so nguoi noi tieng Mong Co tai Trung Quoc. Tieng Mong Co o Trung Quoc tung trai qua nhieu đot bien đong thuan theo thoi the lich su. So nguoi noi ban ngu o Trung Quoc bi sut giam vao cuoi thoi nha Thanh, may man phuc hoi tro lai tu 1947-1965, nhung tai sut giam vao giua nhung nam 1966 va 1976, roi tiep tuc đuoc hoi sinh trong giai đoan 1977-1992, cuoi cung lai bi giam thieu lan ba tu 1995-2012. Tuy nguoi Mong Co tai Noi Mong chiu su anh huong cua đa ngu, nhung đieu đo khong can tro cong cuoc bao ton tieng noi cua ho. Du mot phan dan Mong Co khong con biet noi tieng me đe nua, ho van đuoc chinh phu Trung Quoc coi la dan toc Mong Co va ho thi van tu xung la nguoi Mong Co. Nhung đua tre lai Han-Mong Co cung đuoc ghi nhan la nguoi Mong Co.


Tham khao Lien ket ngoai Lingua Mongolia (mot trang web chuyen ve tieng Mong Co, đa phan ve ban chu viet Mong Co truyen thong) Luu tru ngay 19 thang 3 nam 2022 tai Wayback Machine
StudyMongolian Luu tru ngay 12 thang 4 nam 2016 tai Wayback Machine
Tu đien Bolor tieng Anh-Mong Co
Nhung phong chu Mong Co truyen thong Unicode