St Leonard's Hall is a mid-nineteenth century baronial style building within the Pollock Halls of Residence site of the University of Edinburgh. The hall was designed by John Lessels, and built in 1869-1870 for Thomas Nelson Junior, of the Thomas Nelson family of publishers. It features pepper-pot turrets and a tower with corbelled-out bartizans and a cap-house which is said to be reminiscent of a Highland Croft House. The ceilings were painted by Thomas Bonnar (1800-1874). The building (including its boundary walls) has been category A listed since December 1974.