Steffi Faasusivaitele Hearthington Carruthers (born 24 May 1993 in Samoa) is a Samoan tennis player. Carruthers has a WTA singles career-high ranking of 662 achieved on 13 October 2014. She also has a doubles career-high ranking of 556, achieved on 16 November 2015. She has won two ITF titles in doubles. Playing for Pacific Oceania in Fed Cup, Carruthers has a W/L record of 11–11. Carruthers is the first Samoan woman to play professional tennis and the first Pacific Oceanian player to win a professional tournament.