Karin Knapp (born 28 June 1987) is a retired Italian tennis player.
In her career, Knapp won two singles titles on the WTA Tour, as well as six singles titles and six doubles titles on the ITF Women's Circuit.
On 24 August 2015, she reached her best singles ranking of world No.
33.
On 28 September 2015, she peaked at No.
49 in the doubles rankings.
As a member of the Italy Fed Cup team, Knapp was part of the winning squad in 2013 and has a win/loss record of 3–3.