This is a list of Christian religious houses in Schleswig-Holstein in Germany, including Hamburg and Lübeck, extant and non-extant, and including houses of both men and women. All religious houses were suppressed during the Protestant Reformation in the 16th century, with the exception of four former nunneries (Itzehoe, Preetz, Uetersen and St. John's, Schleswig), which became Protestant collegiate foundations for noblewomen, and still survive today.