| OAL | Oriental Aromatics Limited | 339.6 | 327.0 | 329.1 | 15.9K | -13.1 | | 3.81 | |
| OBCL | Orissa Bengal Carrier Limited | 55.00 | 53.24 | 54.06 | 7.5K | 0.77 | | 1.44 | |
| ODIGMA | ODIGMA CONSULTANCY SOLUTIONS LTD | 36.08 | 34.41 | 34.61 | 16.9K | -0.76 | | 2.15 | |
| OFSS | Oracle Financial Services | 8,372 | 8,150 | 8,170 | 84.7K | -203 | | 2.42 | |
| OILCOUNTUB | Oil Country Tubular Limited | 62.84 | 62.26 | 62.35 | 17.9K | -0.81 | | 1.28 | |
| OLAELEC | Ola Electric Mobility Ltd | 43.04 | 41.50 | 41.86 | 9.79M | -0.02 | | 0.05 | |
| OLECTRA | Olectra Greentech Limited | 1,388 | 1,318 | 1,326 | 350.8K | -58 | | 4.21 | |
| OMKARCHEM | Omkar Speciality Chemicals Limited | 5.390 | 4.950 | 5.280 | 12.9K | 0.080 | | 1.54 | |
| ONELIFECAP | Onelife Capital Advisors Limited | 12.74 | 12.25 | 12.32 | 6.2K | -0.21 | | 1.68 | |
| ONEPOINT | One Point One Solutions Limited | 52.69 | 51.26 | 51.75 | 566.3K | -1.07 | | 2.03 | |
| ONESOURCE | ONESOURCE SPECIALTY PHARMA LTD | 1,682 | 1,594 | 1,630 | 262.0K | -42 | | 2.51 | |
| ONGC | Oil & Natural Gas Corporation Limited | 248.3 | 246.2 | 247.0 | 7.59M | -1.1 | | 0.44 | |
| ONWARDTEC | Onward Technologies Limited | 300.2 | 273.1 | 281.9 | 192.0K | 7.5 | | 2.72 | |
| OPTIEMUS | Optiemus Infracom Limited | 568.5 | 551.6 | 553.7 | 78.9K | -14.5 | | 2.55 | |
| ORICONENT | Oricon Enterprises Limited | 58.40 | 57.20 | 57.95 | 102.5K | -0.04 | | 0.07 | |
| ORIENTPPR | Orient Paper & Industries Limited | 23.94 | 23.60 | 23.71 | 113.1K | -0.23 | | 0.96 | |
| ORIENTTECH | Orient Technologies Limited | 367.5 | 357.0 | 358.7 | 273.4K | -6.0 | | 1.63 | |
| ORISSAMINE | The Orissa Minerals Development | 5,030 | 4,921 | 4,949 | 10.9K | -53 | | 1.06 | |
| ORTEL | Ortel Communications Limited | 1.360 | 1.360 | 1.360 | 21 | 0.060 | | 4.62 | |
| OSIAHYPER | Osia Hyper Retail Limited | 19.99 | 18.75 | 19.15 | 236.7K | -0.37 | | 1.90 | |
| OSWALSEEDS | ShreeOswal Seeds And Chemicals Limited | 13.95 | 12.78 | 13.39 | 23.0K | 0.02 | | 0.15 | |
| OWAIS | Owais Metal and Mineral Processing Ltd | 379.1 | 320.0 | 328.6 | 133.9K | -48.0 | | 12.74 | |