The 1973 NCAA Division III football season included the College Athletic Conference but not the Iowa Intercollegiate Athletic Conference.
College Athletic Conference College Conference of Illinois and Wisconsin Independent College Athletic Conference Iowa Intercollegiate Athletic Conference Michigan Intercollegiate Athletic Association Middle Atlantic Conference Midwest Collegiate Athletic Conference Minnesota Intercollegiate Athletic Conference New England Football Conference New Jersey State Athletic Conference Southern Intercollegiate Athletic Conference (Division III) Southern California Intercollegiate Athletic Conference 
