William Armstrong Wallis (2 July 1856 â 11 November 1927) was an Irish international rugby union player.
A DublinâÂÂborn forward, Wallis was capped five times for Ireland during the early 1880s. He played for Dublin club Wanderers and in the 1887/88 season served as their president. In addition to rugby, Wallis was renowned as a horse breeder and trained the 1916 Irish OaksâÂÂwinning horse Captive Princess.