The 1899 Cleveland Spiders season was the team's 13th and final season in Major League Baseball (MLB), and their 11th season in the National League (NL).

The Cleveland Spiders were an American professional baseball team based in Cleveland, Ohio. The team competed at the major league level from 1887 to 1899, first for two seasons as a member of the now-defunct American Association (AA), followed by eleven seasons in the National League (NL). Early names for the team included the Forest Citys and Blues. The name Spiders itself emerged early in the team's inaugural NL season of 1889, owing to new black-and-gray uniforms and the skinny, long-limbed look of many players. National League Park served as the team's home for its first four seasons until the opening of League Park in 1891.