Police have said he was 21-year-old James Campbell from the Gilford area.
His bike collided with a tractor on the Ballymacanallen Road near Gilford, Co Armagh.at about 1.25 pm today, Wednesday, April 19.
The road remains closed.
Insp Gregory Beckett said: “We would like to hear from anyone who was travelling on the Ballymacanallen Road or who witnessed the collision.”
Anyone with information is asked to contact police on the 101 number.