Molnija is a Russian watch manufacturer founded on 17 November 1947 in Chelyabinsk, then part of the Soviet Union.

Molnija is known for mechanical pocket watches and aviation chronographs. Its current wristwatch collections include Tribute 1984, AChS-1 and the aviation-themed Berkut. The Berkut TSB 3603 model uses the in-house, manually wound calibre 3603.