Infobox last updated on: 01 June 2009.
Julian Knowle (born 29 April 1974) is an Austrian male professional tennis player. Being a born left-hander Knowle is one of now only few on the ATP Tour who plays his forehand, backhand and even volleys double-handed. He is currently Austria's most successful doubles player in history by reaching no. 10 in the ATP doubles ranking in September 2007.
Knowle was a successful player on the ATP Challenger Series, winning the Challenger tournaments in Kyoto (1999), Caracas (2001), Graz (2001) and Andrezieux (2002) and reaching the finals in Yokohama (2000), Bristol (2000), Besancon (2000) and Graz (2003). He also won several Futures tournaments. Knowle's best ATP singles ranking was no. 86 in July 2002. He appeared last in the main draw of a singles tournament in the Graz Challenger in 2005 where he reached the quarter final.