Riaz, a distinguished individual, was born in 1972 to a prestigious Muslim family residing in the Faridpur District, Bangladesh. He is the youngest of eight siblings, comprising six sisters and one brother, Raisuddin Ahamed Siddique. During his formative years, Riaz resided in the CNB staff quarters of Faridpur for the initial sixteen years of his life, under the care of his parents, the late Zainuddin Ahamed Siddique, a government service holder, and Arjumand Ara Begum. His paternal home is situated in Jessore District.
Tragedy struck when Riaz's father passed away in 1988, prompting the family to relocate to Jessore district in 1989. Following his father's demise, Riaz pursued a career in the Bangladesh Air Force (BAF) by taking the entrance exams after his HSC results. He went on to become a top-rate fighter pilot, undergoing training in the Turkish Air Force on a scholarship for a period of one-and-a-half years. Riaz then enrolled at the BAF Academy from 1989 to 1991, where he received flying training and earned his bachelor's degree in science under Rajshahi University. He was subsequently commissioned as a Pilot Officer in the Bangladesh Air Force in 1991.
However, Riaz's tenure in the Air Force was cut short due to a misunderstanding with the authorities, ultimately leading to his dismissal. Following this setback, Riaz relocated to Dhaka in 1994, where he crossed paths with his cousin, actress Bobita, and initiated his film career in 1995. On December 18, 2007, Riaz tied the knot with Mushfika Tina, a dance teacher, in a traditional Muslim wedding ceremony.