| OAL | Oriental Aromatics Limited | 282.7 | 266.0 | 275.4 | 16.4K | 5.0 | | 1.84 | |
| OBCL | Orissa Bengal Carrier Limited | 56.00 | 55.46 | 55.99 | 1.4K | 0.53 | | 0.96 | |
| ODIGMA | ODIGMA CONSULTANCY SOLUTIONS LTD | 29.49 | 25.65 | 27.84 | 38.6K | -1.10 | | 3.80 | |
| OFSS | Oracle Financial Services | 7,212 | 7,077 | 7,165 | 68.9K | -89 | | 1.23 | |
| OILCOUNTUB | Oil Country Tubular Limited | 47.00 | 43.09 | 46.31 | 43.5K | 1.30 | | 2.89 | |
| OLAELEC | Ola Electric Mobility Ltd | 39.79 | 37.70 | 38.27 | 378.68M | -2.61 | | 6.38 | |
| OLECTRA | Olectra Greentech Limited | 1,239 | 1,174 | 1,213 | 3.07M | 29 | | 2.44 | |
| OMKARCHEM | Omkar Speciality Chemicals Limited | 4.450 | 4.200 | 4.210 | 4.3K | -0.170 | | 3.88 | |
| ONELIFECAP | Onelife Capital Advisors Limited | 15.30 | 14.98 | 15.00 | 84.4K | -0.05 | | 0.33 | |
| ONEPOINT | One Point One Solutions Limited | 53.00 | 50.52 | 52.40 | 1.02M | 0.11 | | 0.21 | |
| ONESOURCE | ONESOURCE SPECIALTY PHARMA LTD | 1,554 | 1,405 | 1,545 | 1.88M | 106 | | 7.38 | |
| ONGC | Oil & Natural Gas Corporation Limited | 290.3 | 281.0 | 287.6 | 23.99M | 1.1 | | 0.37 | |
| ONWARDTEC | Onward Technologies Limited | 254.6 | 239.5 | 251.3 | 21.3K | -0.2 | | 0.06 | |
| OPTIEMUS | Optiemus Infracom Limited | 377.2 | 352.5 | 372.7 | 164.0K | -5.2 | | 1.36 | |
| ORICONENT | Oricon Enterprises Limited | 68.85 | 65.05 | 68.00 | 220.7K | 0.70 | | 1.04 | |
| ORIENTPPR | Orient Paper & Industries Limited | 18.22 | 17.25 | 18.00 | 340.8K | -0.04 | | 0.22 | |
| ORIENTTECH | Orient Technologies Limited | 279.3 | 258.6 | 273.4 | 280.5K | -1.2 | | 0.43 | |
| ORISSAMINE | The Orissa Minerals Development | 3,770 | 3,525 | 3,701 | 7.9K | -48 | | 1.27 | |
| ORTEL | Ortel Communications Limited | 1.780 | 1.700 | 1.780 | 722 | 0.080 | | 4.71 | |
| OSIAHYPER | Osia Hyper Retail Limited | 4.250 | 4.250 | 4.250 | 444.1K | 0.200 | | 4.94 | |
| OSWALSEEDS | ShreeOswal Seeds And Chemicals Limited | 12.60 | 11.66 | 12.35 | 58.8K | -0.29 | | 2.29 | |
| OWAIS | Owais Metal and Mineral Processing Ltd | 142.7 | 136.0 | 142.7 | 24.1K | 6.8 | | 4.97 | |