The Under Armour High School All-America Baseball Game is a high school baseball all-star game held annually to spotlight the United States' top high school players who are juniors or seniors. The game is played in late July or August, at Wrigley Field in Chicago.

An all-star game is an exhibition game that purports to showcase the best players of a sports league. The exhibition is between two teams organized solely for the event, usually representing the league's teams based on region or division, but sometimes dividing the players by an attribute such as nationality. Selection of the players may be done by a vote of the coaches and/or news media; in professional leagues, fans may vote on some or all of the roster. An all-star game usually occurs at the midpoint of the regular season. An exception is American football's NFL Pro Bowl, which occurs at the end of the season.