Abstract: Field experiments were conducted at the Regional Agricultural Research Station, Jessore, Bangladesh; during the rabi seasons (winter) of 1999-2000 and 2000-2001 to compare the yield and yield contributing characters of onion (cv. Faridpuri) under different irrigation schedules. The irrigation sequences were: no irrigation (I1); irrigation at five days interval (I2); irrigation at 15 days interval (I3); irrigation at 20 days interval (I4) and irrigation at 30 days interval (I5) up to 30 days before harvesting. Among all the treatments, I2 produced the highest yields over the years (9.01 and 8.99 t ha-1, respectively). The second highest yields of 8.74 and 8.68 t ha-1 were obtained during the two years from the treatment I3which received four irrigations at 15 days interval. However, the yields did not show any significant difference with those of I2. The lowest yields of 3.24 and 3.29 t ha-1 were obtained from non-irrigated control plots in the first and second year, respectively. The pooled data of two years revealed that bulb yield was highest (9.0 t ha-1) with irrigation at 10 days interval but was at par with irrigation at 15 days interval. The average bulb yield increase of the irrigated treatments over the control ranged from 97.28% to as high as 175.66%. The estimated total water use of the two highest yielding treatments were 279.5 and 239 mm, respectively. The economic analysis indicates that gross return and net return were highest in I2 followed by I3. The marginal rate of return was highest in I4.The highest marginal gross margin and the second highest marginal rate of return were obtained from I3. Both of the treatments I2 and I3 gave the highest benefit-cost ratio.