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.

Slave markets and slave jails in the United States were places used for the slave trade in the United States from the founding in 1776 until the total abolition of slavery in 1865. Slave pens, also known as slave jails, were used to temporarily hold enslaved people until they were sold, or to hold fugitive slaves, and sometimes even to "board" slaves while traveling. Slave markets were any place where sellers and buyers gathered to make deals. Some of these buildings had dedicated slave jails, others were negro marts to showcase the slaves offered for sale, and still others were general auction or market houses where a wide variety of business was conducted, of which "negro trading" was just one part.