Kosmos 434 (Russian: Космос 434; meaning Cosmos 434), also known as T2K No.3, was the final uncrewed test flight of the Soviet LK Lander.

It performed the longest burn of the four uncrewed LK Lander tests, validating the backup rocket engine of the LK's Blok E propulsion system.

The LK was the only element of the Soviet human lunar programs that reached this status.

When it reentered over Australia on August 22, 1981 the Soviet Foreign Ministry in Australia admitted that Kosmos 434 was an "experiment unit of a lunar cabin," or lunar lander.

This article about one or more spacecraft of the Soviet Union is a stub.