Mu'iz-ud-din Umar Shaikh Mirza[1] (Persian: عمر شیخ میرزا; 1356 – February 1394) was a member of the Timurid dynasty and a son of its founder, the Central Asian conqueror Timur.

The Mu'izz al-Ansab (The Glorifier of Genealogies), the most important source regarding the structure of the Timurid royal family during this period, is contradictory on this point.

[3] Umar Shaikh proved himself an accomplished warrior and a skilled horseman, taking part in many of his father's campaigns.

[6] Timur's lands were attacked on two fronts; Tokhtamysh launched his assault from Bukhara while his ally Qamar-ud-din Dughlat did so from Ferghana.

Umar Shaikh led the left wing of the army, his brother Miran Shah the right, their nephew Muhammad Sultan the centre and Timur himself the rear.

While initially indecisive, the battle seemed to turn in the Khan's favour when Umar Shaikh's contingent was detached from the main army and nearly overwhelmed.

In 1394, whilst answering summons from his father, Umar Shaikh was killed after being shot in the neck by an arrow fired from the Tuz Khurmatu fortress, near the city of Baghdad.