Final Impact is a science fiction novel by Australian writer John Birmingham, the last volume of his alternate history Axis of Time trilogy.

Admiral Kolhammer returns to sea at the head of a new Task Force with the Clinton at its core after two years of administering the Special Administrative Zone-California.

On 1 June the USSR rejoins the Allied side and declares war against the Axis: They launch a huge attack against Germany and advance on a broad front.

Adolf Hitler has a seizure and suffers permanent brain and muscle damage; with the T4 program in mind, Heinrich Himmler chooses to suffocate him.

The USSR takes two more blows when a massive kamikaze strike cripples their Pacific Fleet, and the A-bomb building facility in Kamchatka is destroyed - both hits scored by the Japanese.

Other reviews noted the large number of plot points which had not been addressed properly, and the disjointed narrative structure used to depict the war.