| 1 | ORACLE INDIA PRIVATE LIMITED | North 24 Parganas | Bidhannagar | Martin Burn Business Park Level 12 Plot-3 Block-BP Sector-V Salt Lake Kolkata |  | | | | |
| 2 | ORACLE INFOTECH | Kolkata | Kolkata | 182A, A.P.C Road, Kol-01 | | | | | |
| 3 | ORANGE FASHIONS | Darjeeling | Siliguri | H/163/140, SHETH SRILAL MARKET | | | | | |
| 4 | ORANGE SECURITY SERVICE | Coochbehar | Coochbehar Sadar | N.N. ROAD | | | | | |
| 5 | ORBIT HOTELS | Purba Medinipur | Contai | OLD DIGHA, BARRIESTER COLONY. | | | | | |
| 6 | ORCHID | Jalpaiguri | Jalpaiguri Sadar | Thana More, Jalpaiguri. | | | | | |
| 7 | ORCHID NURSING HOME | Kolkata | Kolkata | P-17,C.I.T. Road,Scheme-vi M,phoolbagan,Kolkata-54 | | | | | |
| 8 | ORDNANCE FACTORY DUMDUM | North 24 Parganas | | Jessore Road, Kolkata, Dum Dum, Dum Dum, North 24-Parganas, 700028 | | | | | |
| 9 | ORIENTAL | North 24 Parganas | Barrackpore | 91, NEW CHORD ROAD, P.O.ATHPUR | | | | | |
| 10 | ORIENTAL CONSTRUCTION CO. | South 24 Parganas | Alipore | VILL. - PUJALI, P.S. - BUDGE BUDGE, WARD NO. - 12 | | | | | |
| 11 | ORIENTAL ENGINEERING CO. | Kolkata | Kolkata | 17/1,Srimanta dey lane | | | | | |
| 12 | ORIENTAL EXPORTS. | Kolkata | | 99, DR. SURESH CHANDRA BANERJEE RD., P.O. & P.S.-BELIAGHATA,
KOLKATA-700010 | | | | | |
| 13 | ORIENTAL SHOE STORES | Hooghly | Serampore | 81/B,S.C.CHATTERJEE STREET,KONNAGAR,HOOGHLY | | | | | |
| 14 | ORIENT ELECTRIC | Kolkata | Kolkata | 6,GHORE BIBI LANE | | | | | |
| 15 | ORIENT GEMS & ORNAMENTS PVT. LTD. | Uttar Dinajpur | Raigunj Sadar | Thana Road, Ukilpara, Word- 8, Raiganj Municipality, Raiganj, Uttar Dinajpur. | | | | | |
| 16 | ORIENT JEMS AND ORNAMENTS | Jalpaiguri | Jalpaiguri Sadar | D.B.C. Road, Jalpaiguri. | | | | | |
| 17 | ORIGAMI CELLULO PVT. LTD. | Kolkata | | P-12/1, Taratala Road, Kolkata-700 088 | | | | | |
| 18 | ORION SECURITY SOLUTINS PVT. LTD. | South 24 Parganas | Diamond Harbour | DIAHARBOUR SUPER SPECIALITY HOSPITAL | | | | | |
| 19 | ORION SECURITY SOLUTION PVT LTD | Murshidabad | Jangipur | WB PDCL, P.O- Manigram | | | | | |
| 20 | ORI PLAST LIMITED | Howrah | Uluberia | BAGNAN, NEAR SUJATA CINEMA HALL, HOWRAH,711303 | | | | | |
| 21 | ORISSA METALIKS PRIVATE LIMITED | Paschim Medinipur | Kharagpur | GOKULPUR | | | | | |
| 22 | ORISSA METALIKS PRIVATE LIMITED UNIT-II | Paschim Medinipur | | BOMBAY ROAD,GOKULPUR,Kharagpur (Local),SHYAMRAIPUR,Medinipore(W),721301 | | | | | |
| 23 | ORISSA METALIKS PVT LIMITED UNIT-I | Paschim Medinipur | | , GOKULPUR, Kharagpur (Local), SHYAMRAIPUR, Medinipore (W), 721301 | | | | | |
| 24 | ORISSA METALIKS PVT LTD | Paschim Medinipur | Kharagpur | Gokulpur,P.O.-Shyamraipur Khragpur | | | | | |
| 25 | ORISSA METALIKS PVT. LTD. UNIT I | Paschim Medinipur | Kharagpur | Mouja Mathurakismat, JL.No-114, Gokulpur, Kharagpur, | | | | | |
| 26 | ORISSA METALIKS PVT.LTD. UNIT-II | Paschim Medinipur | | BOMBAY ROAD, GOKULPUR, Kharagpur (Local), SHYAMRAIPUR, Medinipore (W), 721301 | | | | | |
| 27 | ORIX AUTO INFRASTRUCTURE SERVICES LIMITED | South 24 Parganas | Baruipur | C/O-COGNIZANT TECHNOLOGY SOLUTIONS INDIA PVT. LTD., PLOT-IT 27, KOLKATA IT PARK SEZ | | | | | |
| 28 | ORIX AUTO INFRASTRUCTURE SERVICES LTD | North 24 Parganas | Bidhannagar | PLOT - 5, BLOCK - GP,SECTOR V,SALTLAKE,KOLKATA - 700091 | | | | | |
| 29 | ORNA | South 24 Parganas | Diamond Harbour | MADHABPUR DIAMOND HARBOUR | | | | | |
| 30 | ORSON HOLDINGS COMPANY LIMITED | Howrah | Howrah Sadar | SANKRAIL INDUSTRIAL PARK, NH-6 BHAGABATIPUR | | | | | |
| 31 | OSCAR EQUIPMENTS PRIVATE LIMITED | South 24 Parganas | Alipore | MOUJA BHASA [KONCHOWKI PETROL PUMP] | | | | | |
| 32 | OSCAR EQUIPMENTS PVT LTD | South 24 Parganas | | MOUJA BHASA DIAMOND HARBOUR ROAD ,PO BISHNUPUR | | | | | |
| 33 | OSL AUTOMOTIVE | Jalpaiguri | Mal Bazar | Caltex More, Mal, Jalpaiguri | | | | | |
| 34 | OSL AUTOMOTIVES PVT. LTD. | Jalpaiguri | Jalpaiguri Sadar | UKILPARA,JALPAIGURI | | | | | |
| 35 | OSL EXCLUSIVE PVT LTD | Kolkata | Kolkata | 3A, Rammohan Mullick Garden Lane | | | | | |
| 36 | OSWAL TOWERS LLP | North 24 Parganas | Barrackpore | 126F B T ROAD | | | | | |
| 37 | OTA FALLOONS FORWARDERS PVT. LTD. | Kolkata | Kolkata | 19,R.N.MUKHERJEE ROAD,IST FLOOR,KOLKATA-700001 | | | | | |
| 38 | OTIS ELEVATOR COMPANY INDIA LTD. | North 24 Parganas | Bidhannagar | Bengal Intelligent Park, Building- Delta,4th Floor, Block-EP&GP, Sector-V, Salt Lake City, Electronics Complex | | | | | |
| 39 | OVERFLOW TRADELINK PVT. LTD. | North 24 Parganas | Barrackpore | 1, KASHINATH DUTTA ROAD, SINTHIMORE | | | | | |
| 40 | OVER NIGHT EXPRESS LTD | North 24 Parganas | Barasat | KAIKHALI,MANDALGANTI | | | | | |
