The Diocese of Nanyang (Latin: Naniamen(sis), Chinese: 南陽) is a Latin Church ecclesiastical jurisdiction or diocese of the Catholic Church in China. Its episcopal see is Nanyang, Henan. The diocese is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Kaifeng.

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• 1844: Established as Apostolic Vicariate of Honan 河南 from the Diocese of Nanjing 南京
• August 28, 1882: Renamed as Apostolic Vicariate of Southern Honan 河南南境
• December 3, 1924: Renamed as Apostolic Vicariate of Nanyangfu 南陽府
• April 11, 1946: Promoted as Diocese of Nanyang 南陽

• Bishops of Nanyang 南陽
  • Bishop Joseph Zhu Bao-yu (朱宝玉) (June 30, 2011 – present)
  • Bishop Joseph Jin De-chen (靳德辰) (1981 - 2011)
  • Bishop Pietro Massa, P.I.M.E. (梅先春) (April 11, 1946 – February 19, 1978)
• Vicars Apostolic of Nanyangfu 南陽府
  • Bishop Pietro Massa, P.I.M.E. (梅先春) (March 29, 1938 – April 11, 1946)
  • Bishop Flaminio Belotti, P.I.M.E. (包海容) (June 14, 1917 – 1937)
• Vicars Apostolic of Southern Honan 河南南境
  • Bishop Simeone Volonteri, P.I.M.E. (安西满) (September 1, 1882 – December 21, 1904)
• Vicars Apostolic of Honan 河南
  • Bishop Miguel Navarro, O.F.M. (April 8, 1856 – September 9, 1877)
  • Bishop Jean-Henri Baldus, C.M. (安巴都) (March 2, 1844 – 1865)