The 1991 Philips Austrian Open, also known as the Austrian Open Kitzbühel, was a men's tennis tournament held on outdoor clay courts at the Kitzbüheler Tennisclub in Kitzbühel, Austria that was part of the ATP World Series of the 1991 ATP Tour. It was the 21st edition of the tournament and was held from 29 July until 4 August 1991. Third-seeded Karel Nováček won the singles title.[1]
See main article: 1991 Philips Austrian Open – Singles. Karel Nováček defeated 
Magnus Gustafsson 7–6(7–2), 7–6(7–4), 6–2
See main article: 1991 Philips Austrian Open – Doubles. 
Tomás Carbonell / Francisco Roig defeated 
Pablo Arraya / Dimitri Poliakov 6–7, 6–2, 6–4