Field experiment was conducted during Rabi season of 2014-15 and 2015-16 at agricultural research farm of Banaras Hindu University, Varanasi (Uttar Pradesh) to study the bio-efficiency of flurochloridone on narrow and broad-leaved weeds in carrot. Flurochloridone 500, 625 and 750 g/ha, pendimethalin 1000 g/ha and metribuzin 525 g/ha were applied as pre-emergence. Maximum reduction in different weed species biomass was observed with flurochloridone 750 g/ha followed by flurochloridone 625 g/ha. Weed control efficiency was highest with flurochloridone at 750 g/ha for all the weed species. Carrot yield was maximum with two hand weeded treatment (31.14 t/ha) and was comparable to flurochloridone 750 g/ha and flurochloridone 625 kg/ha.