Maximilian Karl Lamoral Graf[a] O’Donnell von Tyrconnell (29 October 1812 — 14 July 1895) was an Austrian officer and civil servant who became famous when he helped save the life of Emperor Franz Josef I of Austria.

He was educated in Dresden, then joined the military and served in several engagements in Europe, including in Italy in 1848, and Hungary in 1849, resulting in many awards and promotions.

On 18 February 1853, Maximilian helped save the life of the young Emperor, foiling an assassination attempt by a tailor and former Hussar, János Libényi, a Hungarian nationalist.

About 1 pm, as he looked over a parapet to review an exercise of troops,[3] Libényi approached and struck the Emperor in the neck from behind with a knife.

His customary O'Donnell arms were augmented by the initials of Emperor Franz Joseph within the shield of the archducal House of Austria in the inescutcheon of the double-headed eagle of the Empire.