The present challenge to control engineers is the control of complex nonlinear systems such as energy systems, traffic control systems, chemical processes, and robotic systems. The sensors and transducers are the main devices which are used to send signals to the controller. This book introduced the common types of the sensors and transducers. Organization of the book is as follows: Chapter 1 Presents an introduction to sensors and transducers. Chapter 2 Presents several types of sensors and transducers such as Resistive position transducer, Strain gauge transducer, Inductive transducer, Resistance Thermometers, Piezoelectric Sensor, Inductive Proximity Sensor, Flow sensor, Chemical Sensors, Electrochemical Transducers, Velocity and Motion sensor, Force sensors, Vibration Sensor, Oscillator transducer, and Smart sensors.