Leo Diegel (April 27, 1899-May 5, 1951) is a prominent golfer of the 1920s and early 1930s who won 11 PGA circuit events, and was a four-time winner of the Canadian Open (1924-25, 1928-29). Selected for the inaugural 1927 Ryder Cup team and went on to play on the 1929, 1931 and 1933 teams as well. Diegel's great year was 1928 when he won the Canadian Open and, in winning the 1928 PGA Championship, stopped the four-year winning streak of Walter Hagen (defeating him in the quarter-final to avenge defeats by Hagen in the 1925 quarter-finals and the 1926 final). Diegel achieved the rare double of defending both titles successfully in 1929, this time defeating Hagen in the semi-finals and finishing off The Haig's career. Diegel was runner-up to Bobby Jones at the British Open in 1930, but subsequently did not challenge at any major championships.