Dunay radar (Russian: Дунай, romanized: Dunay literally Danube; NATO: Cat House, Dog House) was a system of two Soviet radars used to detect American ballistic missiles fired at Moscow.

[3] The Dunay-2 was a prototype built in Sary Shagan as part of the experimental missile defence system "A".

The Dunay-3 (Russian: Дунай-3М, romanized: Dunay-3M; NATO: Dog House) was an upgrade of the Dunay-2 located in Kubinka, Moscow and became operational in 1968.

The receiver was a building 100 m×100 m containing 2 passive electronically scanned array radars as well as the command and control centre for the A-35 system.

The Dunay-3U (Russian: Дунай-3У, romanized: Dunay-3U; NATO: Cat House) was built in 1978 as part of the upgraded A-35M anti-ballistic missile system.

One sector of the radar was decommissioned and is now abandoned while the other is used for surveillance of satellites in low Earth orbit.