Emperor Wu of Liang (Chinese: 梁武帝) (464 – 12 June 549), personal name Xiao Yan (蕭衍), courtesy name Shuda (叔達), childhood name Lian'er (練兒), was the founding emperor of the Chinese Liang dynasty, during the Northern and Southern dynasties period. His reign, until its end, was one of the most stable and prosperous among the Southern dynasties. He came from the same Xiao clan of Lanling (蘭陵蕭氏) that ruled the preceding Southern Qi dynasty, but from a different branch.

Emperor Wu established universities and extended the Confucian civil service exams, demanding that sons of nobles (士族) study. He was well read himself and wrote poetry and patronized the arts. Although for governmental affairs he was Confucian in values, he embraced Buddhism as well. He himself was attracted to many Indian traditions. He banned the sacrifice of animals and was against execution. It was said that he received the Buddhist precepts during his reign, earning him the nickname The Bodhisattva Emperor. The emperor is the namesake of the Emperor Liang Jeweled Repentance (梁皇寳懺; Liang Huang Bao Chan), a widely read and major Buddhist text in China and Korea.

At the end of his reign, his unduly lenient attitude towards his clan's and officials' corruption and lack of dedication to the state came at a heavy price; when the general Hou Jing rebelled (侯景之亂), few came to his aid, and Hou captured the imperial capital Jiankang, holding Emperor Wu and his successor Emperor Jianwen under close control and plunging the entire Liang state into anarchy. After Emperor Wu was imprisoned, he was thirsty and asked Hou for honey, but Hou refused to give it to him. After shouting several times, the Emperor supposedly died of hunger and thirst.

Xiao Yan was born in 464, during the reign of Emperor Xiaowu of Song. His father Xiao Shunzhi (蕭順之), who claimed ancestry from the great Han dynasty prime minister Xiao He, was a distant cousin of the Liu Song general Xiao Daocheng, and was part of Xiao Daocheng's close circle of advisors in Xiao Daocheng's eventual seizure of the Liu Song throne and establishment of Southern Qi (as its Emperor Gao) in 479. For Xiao Shunzhi's contributions, Xiao Daocheng created him the Marquess of Linxiang and made him a general. Xiao Yan was Xiao Shunzhi's third son, and his mother was Xiao Shunzhi's wife Zhang Shangrou (張尚柔), who was also the mother of his older brothers Xiao Yi (蕭懿) and Xiao Fu (蕭敷), his younger brother Xiao Chang (蕭暢) and his younger sister Xiao Lingyi (蕭令嫕). Lady Zhang died in 471, predating Xiao Shunzhi's becoming a marquess during Southern Qi.

Xiao Yan had six other brothers born of Xiao Shunzhi's concubines. One of them, Xiao Xiu (475–518) is now mainly remembered because of his comparatively well-preserved funerary statuary ensemble near Nanjing.

Around 481 or 482, Xiao Yan married Chi Hui (郗徽), the daughter of Liu Song official Chi Ye (郗燁) and the Princess Xunyang. They had three daughters—Xiao Yuyao (蕭玉姚), Xiao Yuwan (蕭玉婉), and Xiao Yuhuan (蕭玉嬛), but no sons.

Xiao Yan was considered intelligent and handsome in his youth, and he started his career as a Southern Qi official by serving as military assistant for Emperor Wu's son Xiao Zilun (蕭子倫) the Prince of Baling, and later served on the staff of the prime minister Wang Jian. Wang was said to be impressed by Xiao Yan's talents and appearance, and he once said, "Mr. Xiao will be Shizhong [侍中, a high-level post] before he turns 30, and his honor will be innumerable after he turns 30." Xiao Yan also associated with Wang's successor as prime minister, Emperor Wu's son Xiao Ziliang (蕭子良) the Prince of Jingling, and became one of eight young officials talented in the literary arts particularly befriended by Xiao Ziliang—along with Fan Yun, Xiao Chen (蕭琛), Ren Fang (任昉), Wang Rong (王融), Xie Tiao (謝朓), Shen Yue, and Lu Chui (陸倕). After his father Xiao Shunzhi died in 490, he temporary left governmental service, but subsequently returned, and by 493 was serving on Xiao Ziliang's staff, but he did not join Wang Rong's plan to start a coup to have Xiao Ziliang made emperor when Emperor Wu grew ill in 493; the throne, instead, went to the crown prince, Emperor Wu's grandson Xiao Zhaoye. Xiao Yan subsequently was invited by the prime minister Xiao Luan to serve on his staff, and when Xiao Luan subsequently overthrew the frivolous Xiao Zhaoye in a coup, Xiao Yan was made a general and ordered to defend the important city Shouyang (壽陽, in modern Lu'an, Anhui). When Xiao Luan later took the throne (as Emperor Ming), Xiao Yan was created the Baron of Jianyang. In 495, when Northern Wei forces invade, Xiao Yan was on the frontline fighting Northern Wei troops, and he distinguished himself under the command of Wang Guangzhi (王廣之). Later that year, when Emperor Ming suspected the general Xiao Chen (蕭諶) of treason and executed him, it was Xiao Yan that he sent to arrest and execute Xiao Chen's brother Xiao Dan (蕭誕) the governor of Si Province (司州, modern southeastern Henan).

In 497, with Northern Wei again attacking, Xiao Yan was one of the generals that Emperor Ming sent to aid the embattled Yong Province (雍州, modern southwestern Henan and northwestern Hubei). Even though both he and his commander, Cui Huijing (崔慧景), were subsequently defeated by Northern Wei forces in battle, in 498 Xiao Yan was made the governor of Yong Province and the defender of Yong Province's capital, the important city Xiangyang (襄陽, in modern Xiangfan, Hubei), and he continued in that post after Emperor Ming's death and succession by his son Xiao Baojuan. It was at Xiangyang that Xiao Yan's wife Chi Hui died in 499. Xiao Yan would not take another wife for the rest of his life, although he would have a number of concubines.