Patrick J. Diegnan Jr. (born March 19, 1949) is an American lawyer and Democratic Party politician who has represented the 18th Legislative District in the New Jersey Senate since 2016.

[1][2] Residents of South Plainfield, Diegnan and his wife Anita have been married since 1976 and have two children, Heather and Tara, along with a grandchild.

[3][5] Currently, Diegnan is an attorney in private practice in South Plainfield and is a member of the New Jersey and Middlesex County Bar Associations since 1974.

[10] Sworn into office on May 9, Diegnan won election to the remainder of the term in November, defeating retired judge and former Middlesex County Freeholder Roger W.

[14] The representatives from the 18th District for the 2024—2025 Legislative Session are:[15] Diegnan was the primary sponsor of Assembly Bill 3331, introduced in 2003, which creates the certification of Technology Education for teachers.