The 2017 mid-year rugby union internationals (also known as the Summer Internationals in the Northern Hemisphere) were international rugby union matches that were mostly played in the Southern Hemisphere during the June International Window.
The matches were part of World Rugby's Global rugby calendar (2012–19) that includes Test matches between the touring Northern Hemisphere nations and the home Southern Hemisphere nations. In addition to this, the global calendar gives Tier 2 nations the opportunity to play Tier 1 nations outside the November International Window, increasing competitiveness from the Tier 2 sides.
The international window coincided with the 2017 British and Irish Lions tour to New Zealand, consisting of a three-test series between the Lions and New Zealand, plus seven non-test matches. Prior to the test series, New Zealand hosted Samoa for the first time since 2008. This was the first time that New Zealand hosted a Tier 2 nation since they played Fiji in June 2011. The All Black-Samoan clash followed a curtain raiser between Tonga and Wales, which was played at the same stadium, a neutral venue for the teams. Wales later travelled to Samoa, who hosted the Welsh for the first time since 1994.
South Africa were the only nation to stage a three-test series against a national side, hosting France for the first time since 2010, while playing their first test series against the French since 2005. South Africa's development side South Africa A also played a French side, hosting the French Barbarians in two non-test matches. Argentina hosted England for a two-test series, while Japan hosted Ireland for the first time since 2005, the last time the two sides met. Before Ireland faced Japan, they played a one-off test away to the United States.