Lightning Bug may refer to:
A firefly Photinus (beetle) Photuris (genus) Pyractomena
Aircraft Reflex Lightning Bug, an American kit aircraft design of the 1990s Ryan Model 147 Lightning Bug, an unmanned aerial vehicle
Popular culture Lightning Bug (comics), a Marvel Comics character Lightning Bug (film), a 2004 horror film by writer/director Robert Hall Lightning Bug (novel), a 1987 novel by American author Donald Harington "Lightning Bug" (song), 2020 song by Dean Brody