| OAL | Oriental Aromatics Limited | 327.2 | 305.1 | 308.4 | 26.0K | -11.8 | | 3.67 | |
| OBCL | Orissa Bengal Carrier Limited | 56.98 | 55.08 | 55.61 | 1.5K | -0.44 | | 0.79 | |
| ODIGMA | ODIGMA CONSULTANCY SOLUTIONS LTD | 28.88 | 27.25 | 28.00 | 7.6K | -0.49 | | 1.72 | |
| OFSS | Oracle Financial Services | 8,900 | 8,261 | 8,792 | 2.65M | 665 | | 8.18 | |
| OILCOUNTUB | Oil Country Tubular Limited | 57.42 | 55.56 | 56.51 | 82.6K | -0.86 | | 1.50 | |
| OLAELEC | Ola Electric Mobility Ltd | 38.89 | 37.03 | 37.26 | 76.34M | -1.17 | | 3.04 | |
| OLECTRA | Olectra Greentech Limited | 1,254 | 1,215 | 1,224 | 690.1K | 1 | | 0.07 | |
| OMKARCHEM | Omkar Speciality Chemicals Limited | 4.140 | 3.940 | 3.950 | 27.8K | -0.190 | | 4.59 | |
| ONELIFECAP | Onelife Capital Advisors Limited | 16.80 | 15.01 | 16.80 | 1.51M | 1.52 | | 9.95 | |
| ONEPOINT | One Point One Solutions Limited | 55.20 | 53.52 | 54.65 | 683.9K | 0.06 | | 0.11 | |
| ONESOURCE | ONESOURCE SPECIALTY PHARMA LTD | 1,785 | 1,601 | 1,769 | 2.86M | 158 | | 9.78 | |
| ONGC | Oil & Natural Gas Corporation Limited | 289.8 | 284.1 | 286.3 | 13.52M | 2.6 | | 0.92 | |
| ONWARDTEC | Onward Technologies Limited | 248.9 | 239.9 | 240.7 | 24.3K | -6.2 | | 2.50 | |
| OPTIEMUS | Optiemus Infracom Limited | 426.4 | 406.0 | 408.3 | 190.0K | -19.3 | | 4.51 | |
| ORICONENT | Oricon Enterprises Limited | 66.73 | 65.00 | 65.15 | 36.2K | -0.18 | | 0.28 | |
| ORIENTPPR | Orient Paper & Industries Limited | 19.15 | 18.51 | 18.61 | 319.5K | -0.34 | | 1.79 | |
| ORIENTTECH | Orient Technologies Limited | 290.2 | 276.9 | 278.0 | 170.7K | -9.8 | | 3.41 | |
| ORISSAMINE | The Orissa Minerals Development | 4,119 | 4,033 | 4,069 | 9.9K | -32 | | 0.78 | |
| ORTEL | Ortel Communications Limited | 1.850 | 1.710 | 1.750 | 9.1K | -0.050 | | 2.78 | |
| OSIAHYPER | Osia Hyper Retail Limited | 5.950 | 5.950 | 5.950 | 143.6K | 0.280 | | 4.94 | |
| OSWALSEEDS | ShreeOswal Seeds And Chemicals Limited | 12.96 | 12.01 | 12.69 | 167.7K | 0.03 | | 0.24 | |
| OWAIS | Owais Metal and Mineral Processing Ltd | 200.7 | 195.1 | 200.7 | 57.3K | 9.6 | | 5.00 | |