Emerson "Bud" Dunn (May 15, 1918 – January 11, 2001) was a Tennessee Walking Horse trainer from Kentucky who spent most of his career in northern Alabama. He trained horses for over forty years and won his first Tennessee Walking Horse World Grand Championship at age 74 with Dark Spirit's Rebel; at the time, he was the oldest rider to win the honor. He was inducted into the Tennessee Walking Horse Hall of Fame in 1987 and named trainer of the year in 1980 and 1991. In 1999 at age 81, Dunn surpassed his own record for the oldest winning rider by winning his second World Grand Championship, riding RPM. He died of a heart attack in January 2001.