The 1899 U.S. Open was the fifth U.S. Open. The golf tournament was held September 14–15, 1899, at Baltimore Country Club in Baltimore, Maryland. Willie Smith of the Midlothian Country Club, Chicago, recorded a record 11 stroke victory for his first U.S. Open title.
Willie Smith dominated the championship, shooting rounds of 77-82-79-77, the only player to record three sub-80 rounds. He did not score worse than a 7 on any hole in the championship. Val Fitzjohn, George Low, and Bert Way finished tied for second, 11 strokes behind. Smith's margin of victory was the largest in the U.S. Open until Tiger Woods won the 2000 U.S. Open by 15 shots. Smith's brother Alex, a future two-time U.S. Open champion, finished in 7th place.
Smith won a gold medal and was given custody of the Championship Cup for a year.