IoT-based theft detection using Raspberry Pi, PIR sensor, Pi camera,and USB is a system that detects intruders and alerts the owner in real-time. The PIR sensor detects the presence of human beings by sensing their body heat and motion, while the Pi camera captures images and videos of the intruder. The captured images are then transmitted to the owner's device using a USB interface. The Raspberry Pi acts as the central hubthat processes the information from the PIR sensor and Pi camera and sends alerts to the owner's device. The system can be easily set up and configured using open- source software, and it can be customized to suit specific requirements. Overall, this system provides an effective and affordable solution for securing homes and offices against theft and unauthorized access. In conclusion, IoT-based theft detection using Raspberry Pi, PIRsensor, Pi camera, and USB is an affordable and effective solution for securing homes and offices against theft and unauthorized access. It is easy to set up and configure, and can be customizedto suit specific requirements