Below is a partial list of players in the St. Louis Cardinals minor league organization and rosters of their minor league affiliates. Players individually listed here have not yet played in Major League Baseball (MLB), but have reached an advanced level of achievement or notoriety. Some notable players in the minor leagues may have their own profile pages, such as first-round draft picks. Note that anyone with a past MLB appearance has their own profile page, even if they are currently playing in the minor leagues.

The Wareham Gatemen are a collegiate summer baseball team based in Wareham, Massachusetts. The team is a member of the Cape Cod Baseball League (CCBL) and plays in the league's West Division. The Gatemen play their home games at Clem Spillane Field in Wareham.