Cast
Crew
| Naseeruddin Shah | Acting | Actor |
| Sai Pallavi | Acting | Actor |
| Sreeleela | Acting | Actor |
| Indrans | Acting | Actor |
| Chaitu Jonnalagadda | Acting | Actor |
| Saravana Kumar | Acting | Actor |
| Lallu Prasath | Acting | Actor |
| Renu Desai | Acting | Actor |
| A. Panner Selvam | Art | Art Direction |
| AIM Sathish | Crew | Public Relations |
| Azmat Jagmag | Production | Producer |
| B. Raja | Costume & Make-Up | Makeup Artist |
| D. Ramesh Kuchirayar | Crew | Production Controller |
| Dhanush | Production | Producer |
| Dhanush | Writing | Lyricist |
| Ezhil Arasan | Camera | Director of Photography |
| Hari Haran | Sound | Sound Designer |
| Kabilan Chellaiah | Production | Publicist |
| Kaecha Kampakdee | Crew | Stunt Coordinator |
| Kannan Ganpat | Sound | Sound Mixer |
| Kavya Sriram | Costume & Make-Up | Costume Designer |
| Meenushri Hariharan | Production | Production Executive |
| Nagu Tadala | Costume & Make-Up | Costumer |
| R. Kalaivanan | Editing | Editor |
| Rajeevan | Art | Production Design |
| Rajkumar Periasamy | Writing | Writer |
| Rajkumar Periasamy | Directing | Director |
| Ranga | Editing | Colorist |
| Riaz K. Ahmed | Crew | Public Relations |
| Rokesh | Writing | Lyricist |
| Sachin Sudhakaran | Sound | Sound Designer |
| Sai Abhyankkar | Sound | Playback Singer |
| Sai Abhyankkar | Sound | Original Music Composer |
| Sandesh Agarwal | Production | Co-Producer |
| Sandy | Crew | Choreographer |
| Shraddha Agrawal | Production | Producer |
| Shyam PM | Visual Effects | VFX Supervisor |
| Sreyas Srinivasan | Production | Co-Producer |
| V. Sittrarasu | Camera | Still Photographer |
| Vishu Ramaswamy | Writing | Creative Producer |
| Yannick Ben | Crew | Stunt Coordinator |
Titles
OM Chapter 1: Udhiram - The Blood Wood · OM – Chapter 1: Udhiram – The Blood Wood · ஓம் : Chapter 1 (tam) · Dhanush 55 · D55