The Oak Hill Mausoleum, now Oak Hill Chapel, is a historic religious and funerary building in , the oldest cemetery in Siloam Springs, Arkansas. The massive granite Classical Revival structure was built in 1916 with funding raised by a local citizen group, and originally had a capacity of 72 burials. The mausoleum was designed by Cecil E. Bryan with an interior following a standard plan he used on other small mausoleums. The exterior is what sets this mausoleum apart from others he designed. He was inspired by the works of his former employer, Louis Sullivan.