A field experiment was carried out at Pantnagar during Kharif seasons of 2013 and 2014 to know the bio-efficacy of different doses of azimsulfuron 50 DF against sedges in transplanted rice. The soil of the experimental field was clay loam in texture, medium in organic carbon (0.67%), available phosphorus (29.6 kg/ha) and potassium (176.4 kg/ha) with pH 7.2. Major sedges were: Scirpus roylei, Cyperus iria, Cyperus difformis and Fimbristylis miliacea. Application of azimsulfuron 17.5, 26.25 and 35 g/ha with 0.2% surfactant and 35 g/ha without surfactant provided complete control of Scirpus roylei, Cyperus iria and Cyperus difformis. The lowest dry matter of weeds was recorded with azimsulfuron with 0.2% surfactant from 17.5 to 35 g/ha, which was found at par with azimsulfuron 35 g/ha without surfactant. Among herbicidal treatments, the highest grain yield (6.12 and 6.09 t/ha) was obtained in azimsulfuron + 0.2% surfactant at 26.25 and  35 g/ha, which was significantly similar to azimsulfuron + 0.2% surfactant 17.5 g/ha and azimsulfuron 35 g/ha without surfactant.