Isabel Collischonn (born 16 October 1982) is a former professional German tennis player.

[1] Her highest WTA singles ranking is 409 (achieved October 2003) and her highest doubles ranking is 363 (October 2003).

[2] Collischonn has won two singles and one doubles titles on the ITF.

In September 2003, she won the ITF 25K tennis tournament in Jounieh, Lebanon, with partner Kira Nagy.

[3]