St Catharine's Convent or St Catharine’s Mercy Centre is a Catholic convent of the Sisters of Mercy and a centre for the homeless in Edinburgh, Scotland. It was built in 1860 and originally designed by David Cousin, with additions made in 1887 and 1892. It is located on the corner of Lauriston Gardens and Lauriston Place in the Lauriston area of Edinburgh. In 1992, it became a Mercy Centre with the mission of helping the local homeless. In 1989, it was designated a category B listed building.