Kristian Peter Pless (born 9 February 1981) is a former professional male tennis player from Denmark.

Pless had an excellent junior career, winning the 1999 Australian Open Boys' Singles (defeated Mikhail Youzhny), and reaching the Boys' final at both Wimbledon (lost to Jürgen Melzer), and the US Open (lost to Jarkko Nieminen) the same year.

[1] He turned professional in 1999, and on 28 January 2002, Kristian Pless reached his career-high ATP singles ranking of World No.

Subsequently, he has gradually climbed the rankings, and after successful performances at the Challenger level in autumn 2006, he entered the Top 100 again.

In 2008 he reached two Challenger finals (in Izmir, Turkey and Rimouski, Canada), but ended the year outside of Top 100.