Joanna Sakowicz-Kostecka (born 1 May 1984) is a former tennis player from Poland.
As a professional, her career-high singles ranking is world No. 138, achieved on 9 October 2006. Her highest doubles ranking is world No. 312, achieved on 23 June 2003.
In her career, she won three singles titles and one doubles title on the ITF Women's Circuit.