Abstract Purpose: To perform a dosimetric comparison of field in field forward planned radiotherapy (FiF-FP) and (3D-CRT) with wedge which are used in whole breast irradiation. Method: In thirty patients, two techniques per patient were done (3D-CRT )with wedge and (FiF-FP).A comparison of treatment plans was done, using dose volume histograms for (PTV) and organs at risk. Volumes: V95, V105, D mean, D max, D min V20, V30 and V5 were chosen for the comparison. Results: The 2 plans, revealed a comparable good dose coverage, V95 >95% of PTV. V105% of doses were observed in less than 10% of the (PTV). D max.> 110% of prescribed doses in FiF-FP and > 110% for 3D-CRT. D mean of PTVs were 101.1% for 3D-CRT versus 100.1% for FiF-FP ,all values were less than the tolerance doses of OARs , the two plans were equivalent in sparing (OARs) , V20 Gy and V30 Gy for heart and ipsilateral lung in the 3D-CRT had an edge over FiF-FP. D max of the heart and ipsilateral lung were higher in 3D-CRT than FiF-FP , D max was lower in 3D-CRT than FiF-FP for contralateral breast. (MUs ) needed to deliver 3D-CRT with wedge plan were more than the values needed to deliver FiF-FP. Conclusion: FiF-FP had better dose homogeneity in (PTV) than (3D-CRT) with wedge and with less dose to OARs. (MUs) were less in (FiF-FP) with less time on the machine and less machine consumption. This technique lead to good expected breast irradiation outcome and encourages breast conservative surgery in developing countries