Eldon Industries, Inc. was a toy company located in Hawthorne, California (the hometown of the Mattel toy company), that also in its heyday operated factories in Canada, Spain, England, Japan, and the Netherlands. The company is best known for items and brands that repackaged Japanese toys and distributed them worldwide - an example is the Billy Blastoff astronaut toy produced by Tomy. Slot cars and plastic toys were common Eldon offerings.

Eldon's slogan was "Just for the fun of it." which could be heard in both TV and radio advertisement, as well as in print ads.