Amateur baseball is baseball in which the players either are not paid for playing, or receive only a modest stipend or employment arranged by the team's boosters. Amateur baseball is played in the United States by players of all ages, from young children to adults.

College baseball is baseball that is played on the intercollegiate level at institutions of higher education. In the United States, college baseball is sanctioned mainly by the National Collegiate Athletic Association (NCAA); in Japan, it is governed by the All Japan University Baseball Federation (JUBF).