Xianzong may refer to:

• Emperor Xianzong of Tang (憲宗) (778–820; reigned 805–820), Chinese emperor of the Tang Dynasty
• Emperor Xianzong of Western Xia (獻宗) (1181–1226; reigned 1223-1226), Tangut emperor of the Western Xia Dynasty
• Möngke Khan (1209–1259), Mongol Khan, posthumously known as Emperor Xianzong (憲宗) of the Yuan Dynasty
• Chenghua Emperor (1447–1487; reigned 1464–1487), Chinese emperor of the Ming Dynasty, also known as Emperor Xianzong (憲宗) of the Ming Dynasty

• Hien Tong (disambiguation), Vietnamese equivalents

This disambiguation page lists articles associated with the title Xianzong.
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