Yang Guozhong (Traditional Chinese: 楊國忠; Simplified Chinese: 杨国忠; Hanyu Pinyin: Yáng Guózhōng; Wade-Giles: Yang Kuochung, d. July 15, 756) was an official who achieved high rank due to his family relation with Emperor Xuanzong of Tang's consort Yang Guifei.
Born Yang Zhao (楊釗), he was Lady Yang's distant cousin, a gambler and a wastrel, though not without political cunning. He received the given name Guozhong ("Loyal to the Empire") and ten titles, including Overseer of All Departments (支部郎中). In effect, he became the Chancellor of the Tang Dynasty, and was entirely unsuited for the position.
His unsubtle opposition drove An Lushan into rebellion, and then his gross military miscalculation permitted the latter to capture the imperial capital. Subsequently, he, his cousin the consort, and many of the Yang's family were executed because the army attributed the chaos to them.