In this study, a cyber security-based visitor control system has been designed to maximize participant security in institutions, to prevent unauthorized access, and to easily control participants. The Visitor Control System has been developed using Raspberry Pi 3 and the information of the visitors who will participate is uploaded to the system along with their pictures. Within the scope of cyber security measures, the Visitor Entry Card, which is created with a QR code to prevent fake ID or entrance cards, is sent to the participants days before the dates of programs such as meetings, seminars, interviews, symposiums, workshops, briefings, fairs, and they are requested to enter with these cards. At the entrance points of the institutions, the visitors' Visitor Entry Card is questioned by the security guards and the QR code on the card is scanned with the help of the camera to confirm whether the visitor is authorized or not. After it is confirmed by the security personnel that it is the same as the person's photo, it is allowed to enter.