Background: This study was conducted for Comparative Evaluation of Hand K-flex Files, Paediatric Rotary Files, and Reciprocating Files on Instrumentation Time in children. Material and methods: After ensuring they fulfilled the inclusion requirements, a total of 75 primary molar teeth were then randomly divided amongst the three groups. A stopwatch was used throughout the procedure to keep track of the amount of time spent on each step of the instrumentation. An evaluator observed the child both before and after the operation to make a judgment on the child's conduct. A questionnaire was used to evaluate the postoperative pain for up to a week after the procedure. Results: There was no statistically significant difference in the mean time for access opening based on instrumentation time. Nevertheless, it was discovered that the average amount of time spent on biomechanical preparation varied considerably amongst the three groups (p < 0.001**). When compared to groups II and III, group I's mean time, which was calculated to be 45.6 minutes, was noticeably longer. The average amount of time spent instrumenting an obturation was longer for group III, which was another factor that was discovered to be statistically significant (p< 0.05*). Conclusion: Although paediatric and reciprocating files performed better in clinical settings, the choice of file system did not significantly affect patient behaviour.