The most expensive object ever sold at auction is Leonardo da Vinci's Salvator Mundi. It was sold at Christie's in New York in 2017 for $450.3 million. The painting is a portrait of Jesus Christ, and it is believed to have been painted by da Vinci in the early 16th century. It is one of only a handful of paintings by da Vinci that are still in existence, and it is considered to be one of the most important works of art in the world.

Here is a list of the top 10 most expensive objects ever sold at auction:

1. Leonardo da Vinci's Salvator Mundi ($450.3 million)
2. Les Femmes d'Alger (Version O) by Pablo Picasso ($179.4 million)
3. The Gigayacht ($168 million)
4. Giacometti's Pointing Man ($141.3 million)
5. Rabbit by Jeff Koons ($91.1 million)
6. Portrait of an Artist (Pool with Two Figures) by David Hockney ($90.3 million)
7. Oppenheimer Blue Diamond ($57.5 million)
8. The Pink Star Diamond ($71.2 million)
9. The Hope Diamond ($45.5 million)
10. The Steinway D-274 Concert Grand Piano ($3.87 million)
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