Guido Novak von Arienti (21 January 1859 - 15 August 1928) was an Austrian officer who served in the Austro-Hungarian army in the First World War.

[1] The XVI Corps, of which Novak's brigade was a part, was sent to the Isonzo front in May 1915 to defend against Italian forces.

Novak's 1st Mountain Brigade was tasked with holding the vitally important Hill 383, which they did against numerically-heavy, though poorly planned and organized, Italian attacks.

[1] For leading the defense of Hill 383, Novak was awarded the Knight's Cross of the Order of Maria Theresa, the highest Habsburg military decoration.

Novak was promoted to Lieutenant field marshal (German: Feldmarschalleutnant) on 22 August 1917, after which he was appointed to lead Military Academy at Wiener Neustadt.