The purpose of this study was to look into the nature of seed dormancy variation in distinct maturity groups, such as early, medium, and late duration varieties. During kharif 2017, the field experiment was conducted with 54 rice varieties which were released by the Odisha University of Agriculture and Technology (O.U.A.T), Bhubaneswar and the National Rice Research Institute (N.R.R.I), Cuttack. The number of days required from the day of harvest to achieve 50 percent (DG50) and 80 percent (DG80) germination, as determined by probit analysis, which was used to evaluate the duration of dormancy. In seed biology, probit analysis is used to describe how seed germination progresses over time in response to environmental conditions (e.g. temperature, season etc). The DG50 and DG80 of the varieties ranged from 1 to 60 days and 4 to 79 days, respectively. The variety Khandagiri had the minimum dormancy period of 4 days, while the varieties CR Dhan 506 and CR Dhan 508 had the maximum of 79 days. The percentage of non-germinated seeds on harvest day (NGH0) and 7 days following harvest (NGH7) were used to determine the intensity of dormancy. The NGH0 and NGH7 ranged from 0.67% to 100% and 49.34% to 99%, respectively. Varietal variations in dormancy duration and intensity were indicated in these ranges. The majority of early varieties had a short dormancy period with low intensity, whereas the majority of mid to late varieties had a long dormancy period with high intensity. Dormancy duration and intensity had a strong positive relationship, and both had a strong positive relationship with days to flowering and days to maturity. Several late varieties were observed to have the highest seed dormancy, suggesting that they could be utilised as donors for transferring dormancy to other early varieties to avoid yield losses caused by viviparous germination.