| Mạc Thái Tông 莫太宗 | |
| Emperor of Đại Việt | |
| Full Name: | Mạc Đăng Doanh (莫登瀛) |
| Succession: | Emperor of Mạc Dynasty |
| Reign: | 1529 – 25 January 1540 |
| Predecessor: | Mạc Thái Tổ |
| Successor: | Mạc Hiến Tông |
| Temple Name: | Thái Tông (太宗) |
| Posthumous Name: | Emperor Văn (文皇帝) |
| Era Dates: | Đại Chính (大正) |
| Father: | Mạc Thái Tổ |
| Mother: | Nguyễn Thị Ngọc Toàn |
| House: | Mạc dynasty |
| Birth Date: | 1500 |
| Death Date: | 25 January 1540 (aged 39–40) |
Mạc Thái Tông (1500 – 25 January 1540), known also by his given name Mạc Đăng Doanh, was the second emperor of the Mạc dynasty of Vietnam from 1530 to 1540. His father, Mạc Thái Tổ, was still alive during the first year of his reign and also reigning as “senior emperor” (Thái thượng hoàng).[1] His posthumous name is Văn hoàng đế, and his era name is Đại Chính.
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Mạc Đăng Doanh was born in Cao Đôi village, Bình Hà district (present-day Nam Tan, Nam Sách District, Hải Dương Province). His father was Mac Dang Dung, and his mother was Nguyễn Thị Ngọc Toàn. He was the oldest son of Mac Dang Dung. After Mac Dang Dung seized the throne from Emperor Lê Chiêu Tông and established the Mạc dynasty in 1527, he made his oldest son crown prince. Mac Dang Doanh died on 25 January 1540 after reigning for 10 years.[2] His full posthumous name is Thái Tông Khâm triết Văn hoàng đế.