Major League Baseball is the highest level of play in professional baseball in North America
MLB may also refer to:
Minor League Baseball, a lower level of play in professional baseball in North America
Master of Law and Business, an academic program offered by Bucerius Law School and WHU – Otto Beisheim School of Management
Morgan, Lewis & Bockius, a major American law firm which used to own the rights to the domain name MLB.com before Major League Baseball took it over.
Motor life boat, sometimes used to refer to lifeboats in the USA and Canada<!-- a self-bailing, self-righting and practically unsinkable boat used by the U.S. Coast Guard - hidden as ambiguous (any lifeboat with a motor) and are used by a lot of other countries also -->