Kilian Feldbausch (born 7 September 2005) is a Swiss tennis player. He has a career-high ATP doubles ranking of world No. 1961, achieved on 18 October 2021. He is the first player in tennis history, born in 2005, to feature in a professional tennis tournament in Biel, Switzerland in March 2021. He is the son of former tennis player Cathy Caverzasio.