The 2013 mid-year rugby union tests (also known as the Summer Internationals in the Northern Hemisphere) refer to the international rugby union matches that were played in June 2013, mostly in the Southern Hemisphere. These matches were played in the second year of the global rugby calendar established by the International Rugby Board (IRB), which will run until 2019. They included tests between Northern Hemisphere and Southern Hemisphere nations, whilst some of the touring teams played mid-week matches against provincial or regional sides.