Diaz (born December 18, 1945), is a Filipino businessman, economist and a former congressman who represented the 1st District of Nueva Ecija from 1992-1998.
He is the Chairman and President of RVDIAZ Consultancy & Management Corporation, a consultancy firm specializing in facilitating foreign investments in the Philippines.
Diaz spent his elementary and high school days at San Beda College.
He graduated cum laude and received the Dean's Award for Leadership and Academic Excellence from the same school with a Bachelor of Science in Commerce Major in Accounting degree.
He passed the CPA Board Examination and Career Service Professional Exam in 1967.
While working for the First District of Nueva Ecija, House of Representatives, he had worked on earning an MBA degree from the Asian Institute of Management which he received in 1972.