When it comes to Harley Davidson motorcycles, there’s one that reigns supreme in terms of price. The title of the most expensive Harley Davidson goes to the Cosmic Starship, with a jaw-dropping price tag of $1.5 million. Adorned with cosmic-themed artwork, this limited edition beauty is truly a collector’s dream. While Harley Davidson offers a range of exquisite bikes, the Cosmic Starship sits at the summit of extravagance.