The invisible dragon is a popular urban legend, and is often regarded as a cryptid animal eluding discovery. It is supposed to be either a dragon or pseudo-dragon, with the magical ability to become invisible.
The invisible dragon has inspired several idioms. The most well known is the use of the term "invisible dragon" to mean an unlikely story or fib.
Some people say that invisible dragons are just Opal Dragons colored in colors unable to see for the human/wizard eye, while others say they are distant cousins of the motley dragon.