Pellegrino Tomaso Ronchi (19 January 1930 – 24 October 2018) was an Italian bishop, emeritus of the Diocese of Città di Castello.

He first was appointed bishop of the Diocese of Porto-Santa Rufina on 7 December 1984, receiving his episcopal consecration on 6 January 1985 from Pope John Paul II.

He then resigned from this position, due to illness problem, on 9 November 1985.

Later he was appointed bishop of Diocese of Città di Castello on 7 February 1991.

This article about a 20th-century Italian Catholic bishop or archbishop is a stub.