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Shivaji Satam as ACP Pradyuman (1998–2018; 2024–2025). Initially referred as Sr. Inspector Pradyuman in the first few episodes after which he got a promotion to ACP in episode "The Case of the Thief Within – I" and had been referred to ACP Pradyuman since. In "CID Par Grahan – II" , it was revealed that his full name is ACP Pradyuman Naik Satam.
Dinesh Phadnis as Inspector Fredricks "Freddy" (1998–2018). He first appeared in episode "Kissa Raat Ke Shikhar Ka – I", but his role as Sub-Inspector started in episode "The Case of the Third Man – I" where he was initially referred as Sub Inspector Prince/Michael/Joseph but referred as Fredricks from episode "The Case of the Last Five Minutes – I".
Dayanand Shetty as Sr. Inspector Daya (1998–2018; 2024–2025). He first appeared in episode "The Case of the Anonymous Threats – I" as Sub Inspector Daya. He is referred to as Senior Inspector Daya in later episodes.
Narendra Gupta as Dr. R. P. Salunkhe (1998–2003, 2005, 2007–2018; 2024–2025). He made his debut in the episode "The Case of the Incomplete Letter", where he was initially referred to as Dr. Verma but referred to as Dr. Salunkhe from episode "The Case of the Burnt Letter – I".
Aditya Srivastava as Sr. Inspector Abhijeet (1998; 1999–2018; 2024–2025). He first appeared as character named 'Paresh', who stole ACP's gun in episode "The Case of the Stolen Gun". His role as Inspector Abhijeet started in the episode "The Case of the Stolen Dynamite – I".
Shraddha Musale as Dr. Tarika (2007–2018; 2025). Her debut episode was "The Don's Final Revenge". She re-entered in Season-2 through the episode "Death in the Jungle".
Ansha Sayed as Inspector Purvi (2006-2008; 2011–2018; 2024–2025); she was first seen in episodic roles—as Chanda in "Case of the Double Identity", Khushi in "Case of the Bomb Robbery", Pallavi in "7 Days to Die", and Pamela in "The Gift". Her first episode as Sub-Inspector Purvi was Kissa Paagal Ashiq Kaa.
Hrishikesh Pandey as Inspector Sachin (2010–2016; 2025). He first appeared in episode "Khooni Deewar" under the alias Siddharth, but is later revealed to be an undercover cop and is introduced by ACP as Inspector Sachin in episode "Maut ka Aashirwad". He was last seen in episode "Bank Robbery". He re-entered season 2 through the episode "Gilheri Rakshas". Also in CID Special Bureau, he played the role of Inspector Abhimanyu.
Ajay Nagrath as Inspector Pankaj (2012–2018; 2024–2025); He made his debut in the episode "CID Par Grahan – III"
Janvi Chheda as Inspector Shreya (2012–2016; 2018; 2025); She made her debut in episode "Raaz Sar Aur Haath Ka" where she was introduced along with Sub-Inspector Vineet. She was last seen in episode "Maut Ka Hathoda". She returned as an Intelligence Bureau Inspector in episode "CID 20 Saal Baad". She returns in Season 2 through the episode "ACP Pradyuman tricks CID".
