or Melchior Sun Souen (Chinese: 孫德禎) (1869–1951) was a Roman Catholic prelate who served as Vicar Apostolic of Anguo (1929–1936), Titular Bishop of Esbus (1926–1929), and Prefect of Lihsien (1924–1926).

Melchior Sun Dezhen was born in Beijing, China on 19 Nov 1869 and ordained a priest in the Congregation of the Mission on 24 Jan 1897.

[1][2] On 15 Apr 1924, he was appointed during the papacy of Pope Pius XI as the first Prefect of Lihsien and installed on 17 Jul 1924.

[1] On 24 Jun 1926, he was appointed during the papacy of Pope Pius XI as Titular Bishop of Esbus and on 28 Oct 1926, he was consecrated bishop by Pope Pius XI, with Carlo Cremonesi, Titular Archbishop of Nicomedia, and Celso Benigno Luigi Costantini, Titular Archbishop of Theodosiopolis in Arcadia, serving as co-consecrators.

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