Forrest's jail was the slave pen owned and operated by Nathan Bedford Forrest in Memphis, Tennessee, United States. Forrest bought 87 Adams Street, located between Second and Third, in 1854. It was located next to a tavern that operated under various names, opposite Hardwick House, and behind the still-extant Episcopal church. Forrest later traded, for fewer than six months, from 89 Adams. Byrd Hill bought 87 Adams in 1859. An estimated 3,800 people were trafficked through Forrest's jail during his five years of ownership.

John N. Forrest was one of the six Forrest brothers who engaged in the interregional slave trade in the United States prior to the American Civil War. A disabled veteran of the Mexican–American War, he worked in family businesses, including as the jailor at Nathan Bedford Forrest's slave pen in downtown Memphis.