变速球（英语：changeup），是一种棒球中的变化球，当球离开投手的手时，会像快速直球的样子飞向本垒板，但在接近本垒板时又会往下坠且速度变慢。

投变速球有很多种握法，如深握球：让球紧贴于手掌；或将拇指与食指连成OK的手势，再以中指、无名指和小指扣住球的掌心球。

A changeup is a type of pitch in baseball. The changeup is the staple off-speed pitch, usually thrown to look like a fastball but arriving much more slowly to the plate. Its reduced speed coupled with its deceptive delivery is meant to confuse the batter's timing. It is meant to be thrown the same as a fastball, but farther back in the hand, which makes it release from the hand slower while still retaining the look of a fastball. A changeup is generally thrown 8–15 miles per hour slower than a fastball. If thrown correctly, the changeup will confuse the batter because the human eye cannot discern that the ball is coming significantly slower until it is around 30 feet from the plate. For example, a batter swinging at the ball as if it were a 90 mph fastball when it is coming in at 75 mph means he is swinging too early to hit the ball well, making the changeup very effective.