| OAL | Oriental Aromatics Limited | 250.0 | 232.5 | 235.4 | 32.6K | -0.6 | | 0.23 | |
| OBCL | Orissa Bengal Carrier Limited | 57.00 | 55.00 | 55.51 | 18.8K | 0.15 | | 0.27 | |
| ODIGMA | ODIGMA CONSULTANCY SOLUTIONS LTD | 23.37 | 21.55 | 21.76 | 22.9K | -0.88 | | 3.89 | |
| OFSS | Oracle Financial Services | 7,062 | 6,800 | 6,947 | 980.7K | 348 | | 5.27 | |
| OILCOUNTUB | Oil Country Tubular Limited | 40.32 | 38.02 | 38.25 | 45.5K | -1.48 | | 3.73 | |
| OLAELEC | Ola Electric Mobility Ltd | 25.22 | 23.60 | 24.27 | 109.34M | 0.41 | | 1.72 | |
| OLECTRA | Olectra Greentech Limited | 1,060 | 1,012 | 1,026 | 706.3K | -38 | | 3.55 | |
| OMKARCHEM | Omkar Speciality Chemicals Limited | 3.870 | 3.520 | 3.520 | 36.7K | -0.180 | | 4.86 | |
| ONELIFECAP | Onelife Capital Advisors Limited | 15.75 | 14.32 | 15.01 | 3.36M | 0.01 | | 0.07 | |
| ONEPOINT | One Point One Solutions Limited | 44.76 | 42.10 | 42.43 | 1.27M | -2.48 | | 5.52 | |
| ONESOURCE | ONESOURCE SPECIALTY PHARMA LTD | 1,468 | 1,345 | 1,447 | 840.0K | 113 | | 8.47 | |
| ONGC | Oil & Natural Gas Corporation Limited | 285.0 | 269.7 | 282.0 | 60.04M | 11.8 | | 4.35 | |
| ONWARDTEC | Onward Technologies Limited | 239.1 | 222.1 | 225.2 | 105.7K | -14.1 | | 5.87 | |
| OPTIEMUS | Optiemus Infracom Limited | 329.4 | 306.3 | 312.5 | 437.5K | -19.3 | | 5.80 | |
| ORICONENT | Oricon Enterprises Limited | 65.19 | 63.49 | 64.51 | 94.4K | -0.06 | | 0.09 | |
| ORIENTPPR | Orient Paper & Industries Limited | 15.54 | 14.51 | 14.70 | 1.16M | -0.95 | | 6.07 | |
| ORIENTTECH | Orient Technologies Limited | 258.9 | 238.8 | 240.3 | 360.7K | -18.0 | | 6.97 | |
| ORISSAMINE | The Orissa Minerals Development | 3,505 | 3,280 | 3,307 | 20.0K | -183 | | 5.24 | |
| ORTEL | Ortel Communications Limited | 1.690 | 1.690 | 1.690 | 733 | -0.080 | | 4.52 | |
| OSIAHYPER | Osia Hyper Retail Limited | 4.090 | 4.090 | 4.090 | 371.7K | -0.210 | | 4.88 | |
| OSWALSEEDS | ShreeOswal Seeds And Chemicals Limited | 11.49 | 11.05 | 11.16 | 22.1K | -0.14 | | 1.24 | |
| OWAIS | Owais Metal and Mineral Processing Ltd | 129.7 | 120.0 | 125.2 | 120.6K | 1.7 | | 1.34 | |