The 2006 mid-year rugby union tests (also known as the Summer Internationals in the Northern Hemisphere) refers to the Rugby union Test matches played during between May and June in 2006. It saw several tests between the touring Northern Hemisphere sides and the home Southern Hemisphere sides, including a test series between Australia and England, Argentina and Wales, New Zealand and Ireland and South Africa and Scotland. France played Romania and the Springboks, while Italy played Fiji and Japan. In addition to this, the Barbarians ended their season with victories over England and Georgia and a defeat to Scotland.
Most of the fixtures acted as end-of-season tours of the Northern Hemisphere nations, and pre season matches for the Tri Nations Series and Pacific 5 Nations for the Southern Hemisphere nations.