Cassell House was a hotel/hostelry business in Decatur, Illinois. The firm of Cassell, Stroh & Henderson operated the business. In 1856, it was located on the southwest corner of the public square. In the years after 1856, it was known as the Oglesby House and the St. Nicholas Hotel.
Daily Illinois State Journal (Springfield), 19 May 1856, 2:4; William E. Nelson, ed., City of Decatur and Macon County Illinois (Chicago: Pioneer, 1910), 2:130; Ida M. Tarbell, The Life of Abraham Lincoln (New York: MacMillan, 1917), 1:289.