| OAL | Oriental Aromatics Limited | 243.0 | 240.0 | 242.1 | 22.5K | -0.4 | | 0.15 | |
| OBCL | Orissa Bengal Carrier Limited | 56.50 | 56.08 | 56.18 | 1.7K | 0.07 | | 0.12 | |
| ODIGMA | ODIGMA CONSULTANCY SOLUTIONS LTD | 23.64 | 22.65 | 23.48 | 23.5K | 0.53 | | 2.31 | |
| OFSS | Oracle Financial Services | 7,210 | 6,943 | 7,192 | 153.2K | 175 | | 2.49 | |
| OILCOUNTUB | Oil Country Tubular Limited | 41.94 | 40.35 | 40.80 | 73.4K | -0.16 | | 0.39 | |
| OLAELEC | Ola Electric Mobility Ltd | 29.79 | 28.26 | 28.83 | 134.25M | -0.36 | | 1.23 | |
| OLECTRA | Olectra Greentech Limited | 1,040 | 1,015 | 1,026 | 336.7K | -6 | | 0.59 | |
| OMKARCHEM | Omkar Speciality Chemicals Limited | 4.160 | 4.000 | 4.000 | 3.9K | 0.030 | | 0.76 | |
| ONELIFECAP | Onelife Capital Advisors Limited | 15.41 | 14.70 | 15.04 | 325.4K | 0.04 | | 0.27 | |
| ONEPOINT | One Point One Solutions Limited | 47.20 | 45.38 | 46.92 | 1.06M | 1.04 | | 2.27 | |
| ONESOURCE | ONESOURCE SPECIALTY PHARMA LTD | 1,412 | 1,351 | 1,376 | 111.7K | -32 | | 2.26 | |
| ONGC | Oil & Natural Gas Corporation Limited | 287.6 | 280.0 | 286.7 | 22.89M | 4.8 | | 1.70 | |
| ONWARDTEC | Onward Technologies Limited | 240.0 | 233.0 | 238.9 | 19.5K | 4.5 | | 1.92 | |
| OPTIEMUS | Optiemus Infracom Limited | 325.0 | 313.6 | 322.8 | 96.0K | 1.6 | | 0.50 | |
| ORICONENT | Oricon Enterprises Limited | 67.46 | 65.51 | 65.80 | 58.6K | -1.66 | | 2.46 | |
| ORIENTPPR | Orient Paper & Industries Limited | 17.40 | 16.82 | 17.20 | 221.3K | 0.15 | | 0.88 | |
| ORIENTTECH | Orient Technologies Limited | 261.0 | 252.5 | 254.6 | 229.0K | 0.3 | | 0.11 | |
| ORISSAMINE | The Orissa Minerals Development | 3,573 | 3,440 | 3,540 | 15.5K | 87 | | 2.51 | |
| ORTEL | Ortel Communications Limited | 1.780 | 1.760 | 1.770 | 4.5K | 0.070 | | 4.12 | |
| OSIAHYPER | Osia Hyper Retail Limited | 3.510 | 3.190 | 3.510 | 11.28M | 0.160 | | 4.78 | |
| OSWALSEEDS | ShreeOswal Seeds And Chemicals Limited | 11.07 | 10.50 | 10.85 | 41.1K | 0.18 | | 1.69 | |
| OWAIS | Owais Metal and Mineral Processing Ltd | 117.5 | 112.0 | 117.5 | 15.7K | 5.6 | | 4.96 | |