Mark Seavey Catlin Sr. (November 12, 1882 – May 16, 1956) was an American football player, track athlete, coach, lawyer, and politician. He served as the head football coach at the University of Iowa from 1906 to 1908, and at Lawrence University from 1909 to 1918 and again from 1924 to 1927, compiling a career college football record of 63–40–7. Catlin played football at the University of Chicago and also participated in track and field competitions held adjunct to the 1904 Olympic Games. He later worked as an attorney and also served in the Wisconsin State Assembly from 1921 to 1923.