The highest partnership in Test cricket is 624 runs for the third wicket, achieved by Kumar Sangakkara (287) and Mahela Jayawardene (374) of Sri Lanka against South Africa at the Sinhalese Sports Club Ground in Colombo from July 27 to 29, 2006.
This monumental stand surpassed the previous record of 576 runs set by Sanath Jayasuriya and Roshan Mahanama, also of Sri Lanka, against India in 1997.
Notably, in October 2024, England's Joe Root and Harry Brook recorded a 454-run partnership for the fourth wicket against Pakistan in Multan, setting a new English record for the highest partnership in Test cricket.
These partnerships highlight exceptional collaborations that have significantly impacted Test cricket history.