Fermín Guerra Romero (October 11, 1912 – October 9, 1992), nicknamed "Mike" in the United States, was a Cuban professional baseball catcher who played in Major League Baseball (MLB) for the Washington Senators (1937; 1944–46; 1951), Philadelphia Athletics (1947–50) and Boston Red Sox (1951). Guerra also played Cuban Winter League baseball for two decades, 1934–55. He was listed as 5 feet 10 inches (1.78 m) tall and 155 pounds (70 kg), and threw and batted right-handed.
Guerra was born in Havana. In nine Major League seasons, he played in 565 games. In 1,581 at bats and 1,750 plate appearances; Guerra recorded 168 runs scored, 382 hits, 42 doubles, 14 triples, nine home runs, 168 runs batted in (RBI), 25 stolen bases, 131 bases on balls, a .242 batting average, .300 on-base percentage, .303 slugging percentage, 479 total bases, and 37 sacrifice hits.
Guerra died in Miami Beach, Florida, two days before his 80th birthday.