| Honorific-Prefix: | The Honorable |
| Isagani A. Cruz | |
| Office: | 113th Associate Justice of the Supreme Court of the Philippines |
| Term Start: | 16 April 1986 |
| Term End: | 11 October 1994 |
| Appointer: | Corazon Aquino |
| Predecessor: | Nestor Alampay |
| Successor: | Ricardo J. Francisco |
| Birth Date: | October 11, 1924 |
| Birth Place: | Manila |
| Spouse: | Salvacion Lopez |
| Alma Mater: | The Manuel L. Quezon University (MLQU) University of the Philippines Diliman |
Isagani A. Cruz (October 11, 1924 – March 21, 2013) was a Filipino judge who served as an associate justice of the Supreme Court of the Philippines from 1986 to 1994. He retired from the Supreme Court on October 11, 1994, due to the court's mandatory retirement age of 70 years.[1]
Cruz was originally from Manila.[1] He graduated from Manuel L. Quezon School of Law in 1951. He placed eighth in the 1951 Philippine Bar Examination with a score of 90.12%.[1] He married his wife, Salvacion, on May 3, 1952.[1]
Prior to his appointment to the High Court, Justice Cruz served, among others, as Chair of the Code Commission of the Department of Justice (1966-1972); Senior Partner, Laurel Law Offices; and Dean, College of Law, Lyceum of the Philippines University (1963-1968). He was also a full professor and/or bar reviewer in Political Law, Constitutional Law and International Law in the University of the East, San Beda College, Ateneo de Manila University, University of Santo Tomas, San Sebastian College, Adamson University, and University of Manila (1975-1986).[2]
He wrote a column called "Separate Opinion" for the Philippine Daily Inquirer from 1995 to 2010 after retiring from the Supreme Court.[1]
Isagani A. Cruz died in his sleep on March 21, 2013, at the age of 88.[1] He was survived by his wife of 60 years, Salvacion, and six children - Cesar, Claro, Celso, Carlo, Isagani Jr., and Cynthia.[1]