The Dominican Republic Professional Baseball League (Spanish: Liga de Béisbol Profesional de la República Dominicana) or LIDOM by its acronym in Spanish, is a winter professional baseball league consisting of six teams spread across the Dominican Republic; it is the top baseball league in that country. The league's players include many from Major League Baseball, and the Dominican league's champion plays each year in the Caribbean Series.
Each team plays a fifty-game round-robin schedule that begins at the middle of October and runs to the end of December. The top four teams engage in another round-robin schedule with 18 games per team from the end of December to the end of January; the top two teams in those standings then play a best-of-nine series for the national title. The league's champion advances to the Caribbean Series to play against the representatives from Mexico, Venezuela, and Puerto Rico.
Baseball was introduced in the Caribbean in 1866 by Cuban students, including Ernesto and Nemesio Guilló, returning from their studies in the United States. Early exchanges between Cuban players and sailors loading sugar in the then Spanish colony of Cuba helped foment enthusiasm for the game. .. Eight years later, in 1874, the first organized game of baseball was played between Cuban teams.
In the years to come it would be Cuba that spread baseball throughout the Caribbean. When the Ten Years' War (1868-1878) in Cuba brought turmoil to the colony, many Cubans fled their country and migrated to the Dominican Republic, bringing baseball with them. In the 1920s the Dominicans began to play against neighboring countries.