Erik Väderhatt was a more or less mythic Swedish king. The cognomen Weatherhat refers to the fact that his ships always had good wind when he pillaged around the Baltic Sea.

His place in the Swedish line of kings is mysterious, and so he is either considered to be the same as Erik Emundsson or, according to Gesta Danorum, one of Ragnar Lodbrok's sons. See Saxo's kings of Sweden.