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Minor League Baseball Umpire Development is the entity which is responsible for the training, evaluation, and recommendation for promotion, retention, or release of all umpires in the Minor League Baseball system throughout the United States and Canada. Minor League Baseball Umpire Development is a wholly owned subsidiary of the National Association of Professional Baseball Leagues (NAPBL).

At mid-season and end of each year, an evaluation is written by the staff on every Minor League umpire. The umpire's evaluations are based on performance during the year and are used by the Minor League presidents to determine whether or not the umpire will advance in classification the following season.

Each year in February, Minor League Baseball Umpire Development holds its annual Advanced Course, where prospective rookie umpires are invited for instruction and evaluation of their umpiring abilities. The students who rank the highest at the Advanced Course are recommended for the first openings in the Rookie and Short-A leagues each year, thereby beginning their careers in professional baseball.

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