| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Pierre Lambert Ledrou | |
| Titular Bishop of Porphyreon | |
| Church: | Catholic Church |
| Term: | 1641–1721 |
| Predecessor: | Giuseppe Eusanio |
| Successor: | Agostino Nicola degl'Abbati Olivieri |
| Ordination: | 12 April 1664 |
| Consecration: | 21 December 1692 |
| Consecrated By: | Fabrizio Spada |
| Birth Date: | 1641 |
| Birth Place: | Huy, Belgium |
| Death Date: | 6 May 1721 (age 80) |
Pierre Lambert Ledrou, O.E.S.A. (1641 – 6 May 1721) was a Roman Catholic prelate who served as Titular Bishop of Porphyreon (1692–1721).
Pierre Lambert Ledrou was born in Huy, Belgium in 1641 and ordained a priest in the Order of Hermits of St. Augustine on 12 April 1664.On 25 June 1692, he was appointed during the papacy of Pope Innocent XII as Titular Bishop of Porphyreon.On 21 December 1692, he was consecrated bishop by Fabrizio Spada, Cardinal-Priest of San Crisogono, with Michelangelo Mattei, Titular Archbishop of Hadrianopolis in Haemimonto, and Giovanni Battista Visconti Aicardi, Bishop of Novara, serving as co-consecrators.He served as Titular Bishop of Porphyreon until his death on 6 May 1721.
While bishop, he was the principal co-consecrator of: