Reacher is an American action crime television series developed by Nick Santora for Amazon Prime Video. Based on the Jack Reacher novel series by Lee Child, it stars Alan Ritchson as the title character, a self-proclaimed drifter and former U.S. Army military police officer with formidable strength, intellect, and abilities. During his travels, Reacher crosses paths with dangerous criminals and battles them.

The first season, based on the first novel in the series, Killing Floor, was released on February 4, 2022. The second season, based on the eleventh novel, Bad Luck and Trouble, began on December 15, 2023, and concluded on January 19, 2024. The third season, based on the seventh novel, Persuader, premiered on February 20, 2025, and concluded on March 27, 2025. In October 2024, before the third season premiere, the series was renewed for a fourth season based on the thirteenth novel, Gone Tomorrow.

A spin-off series, Neagley, is in production.