In everyday life, many activities are found. One of them is waiting in line. Queuing is a boring thing. Moreover, the queue arrangement was irregular and officers did not pay attention to who was queuing first. So it is not uncommon to cause complaints and even get angry. Therefore, to handle problems in queuing, queuing simulation is applied using the first in first out algorithm. With this algorithm, it can help determine who will be served first. Simulation is a way that is done to apply a more real system estimate. In this case, the writer uses the first in frst out algorithm. The first in first out algorithm, which is first to enter, first to exit. In this case, who is the first to queue, he will be served first and finish first. In this way, it is hoped that it can help in determining who will be served first. So that there are no complaints from customers at the Parkson department store shopping center.