In Finnish mythology, Ukko (Estonian spelling Uku) is a god of sky, weather, crop (harvest) and other things. He is also the most significant god in Finnish mythology and the Finnish word ukkonen, thunderstorm, is derived from his name. In the Kalevala he is also called ylijumala (over god), as he is the god of things above. He makes all his appearances in myths solely by natural effects when asked. "Ukko" in contemporary Finnish means old man.

See also:

Finnish paganism