A joint resolution designating the regal fritillary as the official state butterfly of the state of Iowa.

HJR 4 designates the regal fritillary butterfly (Speyeria idalia) as Iowa's official state butterfly. The bill requires the state historical museum to display images of the butterfly and mandates that the Iowa Official Register include a picture and description of it alongside other state symbols like the state flower and bird. This is a ceremonial designation with no regulatory or funding changes, solely recognizing the butterfly as a symbol of Iowa's prairie heritage.