[9] Roy made his debut in the Hindi film industry with Jaan Tere Naam (1992) which was a commercial success.

In 2013, he played the main antagonist in the Akshay Kumar starrer BOSS, and in 2014 he appeared in 2 States in which his performance received much appreciation.

[13] In the same year, he made his debut in Telugu with N.T.R Jr. starrer Jai Lava Kusa, where he played the role of main antagonist Sarkar.

Before Kammal got started, Balaji Telefilms also offered Ronit for Kasautii Zindagii Kay as Rishabh Bajaj, a middle-aged business tycoon.

That also landed him in Balaji Telefilms' Kyunki Saas Bhi Kabhi Bahu Thi as Mihir Virani, replacing Amar Upadhyay and Inder Kumar.

[18] From 2009 to 2011, he played the role of Dharamraj in NDTV Imagine's Bandini, which won him accolades for his astonishing portrayal of a crude and ruthless diamond merchant who is never defeated.

He returned to the drama genre in 2014 with Balaji Telefilms's Itna Karo Na Mujhe Pyar as Dr. Nachiket Khanna, alias Neil K opposite Pallavi Kulkarni.

In 2018, Roy made his digital debut in an ALTBalaji's web series Kehne Ko Humsafar Hain along with Mona Singh and Gurdeep Kohli.

With his performances in Kasautii Zindagi Kay, Kyunki Saas Bhi Kabhi Bahu Thi, Bandini, Adaalat and Itna Karo Na Mujhe Pyaar, Roy established himself among the leading and highest-paid actors of Hindi television.