Walter Joseph Mattick (March 12, 1887 – November 5, 1968) was a Major League Baseball center fielder who played for the Chicago White Sox from 1912–1913 and briefly for the St. Louis Cardinals in 1918. He batted and threw right-handed.
Mattick's son Bobby Mattick played 5 seasons in the 1930s and 1940s, mostly with the Chicago Cubs.