This document provides an introduction to ship propulsion engineering. It discusses how ships have evolved from primitive wooden structures moved by oars and sails to various hull forms designed for different purposes and seas. Transportation by sea allows for cargo, passengers, and payloads to be carried by buoyancy forces, requiring less power than other modes of transportation. Ships move through both water and air, facing resistance drag forces from both environments. Propulsors, most commonly screw propellers, impart forward thrust forces to overcome drag and allow ships to cruise. Ship propulsion science studies resistance sources and relations to optimize hull design and select the most efficient propulsor. Selection of an ideal propeller and its rotational speed to match the engine is also