Walter Newton "Walt" Justis (August 17, 1883 – October 4, 1941), nicknamed "Smoke", was a Major League Baseball pitcher who played in 1905 with the Detroit Tigers.
He batted and threw right-handed.
Justis had a 0–0 record, with an 8.10 ERA, in 2 games, in his one-year career.
He was born in Moores Hill, Indiana, and died in Greendale, Indiana.