Petrus Augustus de Génestet (P.A. de Génestet) (Amsterdam, November 21, 1829 – Rozendaal, July 2, 1861) was a Dutch poet and a theologian.
Petrus Augustus de Génestet lost both of his parents at a very young age; after that he lived with his uncle, the Dutch painter Jan Adam Kruseman. He studied at the Amsterdamse Atheneum and the Seminarium der Remonstrantse Broederschap to become a preacher. He became a preacher in March 1852 and worked in Moordrecht. In December of the same year he started working in Delft, the same city that still has the Génestetkerk, a church that was named after him. Shorty after moving to Delft he got married to Henriette Bienfait in Bloemendaal. They had four children. In 1859, both his wife and oldest child died of tubercolosis, and because of his poor health he had to quit working as a preacher. He moved to Amsterdam, but spent most of his summers in Bloemendaal. Two years later, in 1861, he died in Roozendaal due to tubercolosis. After his death, poet Bernard ter Haar wrote "Op het Kerkhof te Roozendaal" ("at the cemetery of Roozendaal") for him. In 1862 the memorial for De Génestet at the Roozendaal cemetery was revealed.