Yang Tong (605–619), known in traditional histories by his princely title of Prince of Yue or by his era name as Lord Huangtai, posthumous name (as bestowed by Wang Shichong) Emperor Gong), courtesy name Renjin, is an emperor of the Chinese Sui Dynasty.

During the disturbances that permeate throughout the Sui state late in the dynasty's history, his grandfather Emperor Yang leaves him in charge of the eastern capital Luoyang, and after Emperor Yang is killed by the general Yuwen Huaji in 618, the Sui officials in Luoyang declare Yang Tong emperor.

However, soon one of these officials, Wang Shichong, seizes power, and in 619 has Yang Tong yield the throne to him, ending Sui.

Soon, he is killed on Wang's orders.