is a small Roman Catholic chapel, located beneath the Cemetery Church of All Saints in Sedlec, a suburb of Kutná Hora in the Czech Republic. The ossuary is estimated to contain the skeletons of between 40,000 and 70,000 people, whose bones have in many cases been artistically arranged to form decorations and furnishings for the chapel.
Four enormous bell-shaped mounds occupy the corners of the chapel. An enormous chandelier of bones, which contains at least one of every bone in the human body, hangs from the center of the nave with garlands of skulls draping the vault. Other works include piers and monstrances flanking the altar, a coat of arms of House of Schwarzenberg, and the signature of Rint, also executed in bone, on the wall near the entrance.