Background: Working length (WL) determination is an essential step in endodontic treatment, and should be performed using accurate armamentarium in order to help gain a successful treatment outcome; this procedure may be performed using several methods, one of which is an electronic apex locator (EAL) measurement. Hence; the present study was conducted for assessing the impact of root canal curvature on the accuracy of an electronic apex locator. Materials & Methods: 60 freshly extracted mandibular firs molars were included in the present study. Grouping of all the samples broadly was done into three study groups as follows: Group 1: Specimens with mild canal curvature (Less than 20), Group 2: Specimens with moderate canal curvature (In between 20 and 36), and Group 3: Specimens with severe canal curvature (More than 36). Actual root canal length was determined through a number 10 file. This was named as actual working length (AL). Electronic Working Length (EL) was evaluated. All the results were then recorded in Microsoft excel sheet and were analysed by SPSS software. Results: Mean difference between AL and EL was 0.182 for group 1, 0.294 for group 2 and 0.276 for group 3. While comparing statistically, significant results were obtained while comparing in between group 1 and group 2 and between Group 2 and group 3 respectively. Conclusion: Under the light of above obtained data, the authors concluded that electronic working length is slight significantly affected with curvature of the root canal. Key words: Apex locator, Curved root canal