Warwick Windridge Armstrong (22 May 1879 – 13 July 1947) was an Australian cricketer who played 50 Test matches between 1902 and 1921. An all-rounder, he captained Australia in ten Test matches between 1920 and 1921, and was undefeated, winning eight Tests and drawing two. Armstrong was captain of the 1920–21 Australian team which defeated the touring English 5–0: one of only three teams to win an Ashes series in a whitewash.