| OAL | Oriental Aromatics Limited | 377.4 | 343.5 | 373.0 | 45.2K | 20.8 | | 5.89 | |
| OBCL | Orissa Bengal Carrier Limited | 53.77 | 51.51 | 52.39 | 12.3K | -0.72 | | 1.36 | |
| ODIGMA | ODIGMA CONSULTANCY SOLUTIONS LTD | 22.90 | 22.30 | 22.64 | 7.1K | 0.34 | | 1.52 | |
| OFSS | Oracle Financial Services | 10,930 | 10,549 | 10,652 | 452.7K | -191 | | 1.76 | |
| OILCOUNTUB | Oil Country Tubular Limited | 61.83 | 57.80 | 58.70 | 52.3K | -0.19 | | 0.32 | |
| OLAELEC | Ola Electric Mobility Ltd | 37.75 | 36.27 | 37.08 | 40.5M | 0.08 | | 0.22 | |
| OLECTRA | Olectra Greentech Limited | 1,344 | 1,297 | 1,336 | 224.9K | 18 | | 1.37 | |
| ONELIFECAP | Onelife Capital Advisors Limited | 37.80 | 36.00 | 36.33 | 24.6K | -0.83 | | 2.23 | |
| ONEPOINT | One Point One Solutions Limited | 54.56 | 53.24 | 53.98 | 272.6K | -0.09 | | 0.17 | |
| ONESOURCE | ONESOURCE SPECIALTY PHARMA LTD | 1,663 | 1,632 | 1,654 | 87.3K | 0 | | 0.02 | |
| ONGC | Oil & Natural Gas Corporation Limited | 253.6 | 248.3 | 248.8 | 7.64M | -3.6 | | 1.43 | |
| ONWARDTEC | Onward Technologies Limited | 294.0 | 282.0 | 290.7 | 60.9K | -0.8 | | 0.27 | |
| OPTIEMUS | Optiemus Infracom Limited | 610.0 | 591.1 | 600.0 | 150.6K | -15.6 | | 2.53 | |
| ORICONENT | Oricon Enterprises Limited | 55.70 | 53.75 | 55.03 | 18.7K | 0.22 | | 0.40 | |
| ORIENTPPR | Orient Paper & Industries Limited | 17.80 | 17.10 | 17.58 | 262.6K | -0.18 | | 1.01 | |
| ORIENTTECH | Orient Technologies Limited | 260.0 | 253.2 | 258.8 | 82.1K | 1.6 | | 0.63 | |
| ORISSAMINE | The Orissa Minerals Development | 3,782 | 3,551 | 3,747 | 9.1K | 99 | | 2.70 | |
| ORTEL | Ortel Communications Limited | 1.820 | 1.690 | 1.800 | 9.7K | 0.030 | | 1.69 | |
| OSIAHYPER | Osia Hyper Retail Limited | 3.030 | 2.920 | 2.990 | 145.3K | -0.020 | | 0.66 | |
| OSWALSEEDS | ShreeOswal Seeds And Chemicals Limited | 10.25 | 9.91 | 10.03 | 20.1K | -0.16 | | 1.57 | |
| OWAIS | Owais Metal and Mineral Processing Ltd | 99.70 | 96.10 | 99.30 | 4.3K | 0.30 | | 0.30 | |