Karolina Kosińska (Polish pronunciation: [karɔˈlina kɔˈsiɲska, -ˈsij̃ska]; born 17 June 1986) is a retired tennis player from Poland. Kosińska began playing tennis aged seven, her favourite surface was clay. As a professional, her career-high singles ranking was world No. 253, achieved in July 2005, in doubles No. 144 (September 2007).