National Association can refer to:

Kokumin Kyōkai, a defunct political party in Japan known in English as National Association
National Association, or "N.A.", the official designation of federally chartered banks in the United States.
National Association of Base Ball Players (1857–1870), the governing body of early high-level but officially non-professional baseball in the United States.
National Association of Professional Base Ball Players (1871–1875), regarded by baseball historians as the first professional baseball league. The league split from the NABBP in 1871 and was replaced after 1875 by the National League.
National Association (minor league baseball) (1879–1880), a minor league baseball league that played for two seasons.
National Association of Professional Baseball Leagues, the former name of the governing body of Minor League Baseball.
HSBC Bank USA signs with the firm name N.A. or National Association