投球机，又称发球机，是一种用于棒球及垒球等球类运动的机器，做为这些运动的击球练习之用。

投球机主要用两种动作方式，一种是以机械臂投球，另一种是借由轮子（通常是胶轮）的转动而投球。大多数投球机可调整球速，最高可投出每小时160公里（99英里）的球，且可投出各种不同球路的球。喂球的方式可以是人工喂球或使用喂球机自动喂球。

A pitching machine is a machine that automatically pitches a baseball to a batter at different speeds and styles. Most machines are hand-fed, but there are some that automatically feed. There are multiple types of pitching machines; softball, baseball, youth, adult, and a combination of both softball and baseball.