Walter Oswald Lanfranconi (November 9, 1916 – August 17, 1986) was a Major League Baseball pitcher.

Lanfranconi made his major league debut in relief against the Philadelphia Phillies at Wrigley Field (September 12, 1941).

In one of his best games, he defeated the Philadelphia Phillies 7–1 in the nightcap of a 4th of July double-header at Shibe Park with 28,580 fans in attendance.

[1][2] Lanfranconi's career totals include a record of 4–5 in 38 games, 70 innings pitched, 19 strikeouts, and an ERA of 2.96.

Lanfranconi missed the 1943–45 baseball seasons due to military service with the US Army during World War II.