Cliven Sven James Loubser (born 24 February 1997) is a Namibian rugby union player, who currently plays for in Major League Rugby (MLR). He represents internationally. His regular position is fly-half.
Loubser previously played for Yorkshire Carnegie in the RFU Championship and Utah Warriors (MLR).
Loubser was born in Rehoboth. He made his test debut for in 2017 against .