Ernest Herman Frank Gust (January 24, 1888 – October 26, 1945), nicknamed "Red", was an American Major League Baseball player.
In three career games (August 17 – 19, 1911), each against the Washington Senators, Gust had no hits in 12 at-bats, playing first base.
Gust received his opportunity to play for St Louis after batting .354 with 17 triples and a slugging percentage of .498 for the Harrisburg Miners/Jackson Climbers in the Class D Kentucky–Illinois–Tennessee League.
From 1913 to 1915, Gust played for Savannah in the Class C South Atlantic League, batting .302 in 1914.
In his first game for St. Louis, the Browns lost as Walter Johnson pitched a 5–0 shutout for Washington.