Justice Rosmari D. Carandang was born in Ilog, Taal, Batangas, and a daughter of two public school teachers, Sixto and Loreto Carandang. She is a consistent valedictorian from her grade school days at San Luis Elementary School to fourth year high school at Batangas West High School. A college scholar for four semesters, she obtained her Bachelor of Arts Major in Political Science at the University of the Philippines. Also from the same university, she obtained her Bachelor of Laws graduating Salutatorian of the class and Cum Laude in 1975. She garnered 9th place in the 1975 Bar examinations.
Before she joined the Judiciary, Justice Carandang was connected with private financial and government institutions.
In December 1993, she was appointed Presiding Judge of the Regional Trial Court of Manila, Branch 12, serving also as one of its Vice-Executive Judges. She was appointed Associate Justice of the Court of Appeals in March 2003, serving the Court for over 15 years until her appointment to the Supreme Court of the Philippines.