But Bezos could soon be knocked off his perch, because he and his wife MacKenzie Bezos plan to divorce after 25 years. Washington state's communal property laws could entitle her to half her husband's fortune.
For now, Jeff Bezos remains insanely wealthy, and capable of making truly stunning purchases. Here are 20 examples.
1. Vacays with the fam
He's the CEO of a company that never stops selling, but Jeff Bezos knows how to take an occasional timeout. He makes time for vacationing.
Bezos is known to travel with an entourage. He has often brought his parents, siblings and in-laws along for adventures.
In 2017, the Bezos extended family went to Rome.
2. A colossal clock
Bezos has invested $42 million in a 10,000-year clock being built by the Long Now Foundation.
The clock, which will tick just once a year, is under construction on land Bezos owns in the Sierra Diablo Mountains in Texas.
Special rooms in the clock chambers will open at specific intervals, and a unique chime will ring each year. The builders want visitors to consider how we can make sure humanity survives to hear all 10,000 chimes.
3. A most luxurious watch
Jeff Bezos also owns a personal timepiece with a big price tag: a wristwatch that retails for $8,000-$12,000 and was made by swanky Swiss watchmaker Ulysse Nardin.
The stunning piece of jewelry displays both the time and date and is made of stainless steel and sapphire crystals. Its strap is fashioned from fine leather.
Some of the clockwork pieces within the watch date back to 1846.
4. A dream of space travel
Amazon isn't Bezos' only innovative company. He's the founder of Blue Origin, an aerospace company that aims to make flying into space something anyone can do.
In a massive Texas cornfield, Blue Origin has been testing rockets that launch and land vertically. Once the technology is perfected, the company hopes to offer commercial flights to space.
Bezos has been quoted saying he funds Blue Origin by selling about $1 billion in Amazon stock each year.
5. Surprisingly modest cars
Jeff Bezos probably has staffers who drive him around in limousines these days. But he was famously seen behind the wheel of rather simple vehicles long after he first became a billionaire.
The Amazon founder had a cherished 1987 Chevrolet Blazer that he drove for years and took on cross-country road trips.
Bezos struck it rich when his company went public in 1997. So he upgraded his transportation: to a still-modest 1996 Honda Accord. Until 2013, his wife was still driving him to work in a Honda.
6. An outlet for his curiosity
What happens when you have a lot of money and a healthy sense of curiosity? When you're Jeff Bezos, you found an organization called Bezos Expeditions.
It provides funding for ideas, movements and businesses that Bezos is interested in. Blue Origin and the 10,000-year clock are both part of the venture.
It also provided money for retrieval of pieces of Apollo 11, and has invested in Airbnb, Twitter, Uber and other cutting-edge businesses.
7. A ground-floor investment in Google
In 1998, the internet was taking off, but the financial side of it was still largely uncharted territory. Jeff Bezos took a big gamble on Google, investing a reported $1 million in the search-engine company.
That was a very big deal considering that Bezos was worth a "mere" $1.6 billion at the time.
Now that Google is a thriving tech giant right up there with Amazon, Bezos' investment has proven to be money well spent.
8. A deluxe apartment in the sky
Bezos owns a massive apartment in a ritzy high-rise building in New York City.
It's actually three connected apartments totaling 10,000 square feet that he bought in 1999 from Tommy Mottola, the music industry executive once married to Mariah Carey.
The Manhattan real estate gives Bezos a place to crash during his occasional trips to the Big Apple.
9. A chunk of downtown Seattle
In Amazon's hometown of Seattle, Jeff Bezos purchased four downtown city blocks and constructed some of the most futuristic office space you have ever seen.
The biospheres and other unique architecture in the area known as Denny Triangle likely help employees come up with new ideas to keep Amazon thriving.
Bezos knows how to keep his company looking innovative, which helps to bolster the brand.
10. The Washington Post
In 2013, Jeff Bezos bought the legendary newspaper The Washington Post for $250 million. In the deal, he also acquired a Spanish-language paper and several smaller national and local papers.
Bezos said he was attracted to The Post because he admired its journalistic style and standards.
The paper has had a rebirth under the Amazon founder. It has expanded its online presence, won major awards, beaten the competition to major scoops — and drawn angry tweets from the White House.
11. A private jet
Since Amazon and Jeff Bezos' other companies are all over the world, it makes sense that he would buy a private jet.
His Gulfstream G-650ER came with a price tag of $65 million. But while private jets are known for requiring frequent stops, this beauty travels farther and faster than comparable ones.
It's OK to pay for comfort and convenience if you have the money to spare.
12. Donations to charity
The Bezos Family Foundation handles all of Jeff Bezos' philanthropic efforts. He has been criticized because his giving has seemed relatively small compared to that of other billionaires like Mark Zuckerberg and Bill Gates.
In a tweet seeking suggestions of causes to fund, Bezos said many of his business ventures "are contributing to society and civilization in their own ways."
Shortly after that tweet, Bezos and wife MacKenzie Bezos reportedly gave $33 million to support "Dreamers": undocumented immigrants who came to the U.S. as children.
13. A double-sized estate
Every king needs his castle. Bezos has more than one.
Mansion Global says his estate in Medina, Washington, is on a 10-acre lot and includes two homes, each with five bedrooms and four bathrooms. Fellow billionaire Bill Gates is his next-door neighbor.
The sprawling property is conveniently located 15 minutes from Amazon's headquarters.
14. A house in DC that was literally a museum
Maybe it's fitting that the owner of one Washington institution — The Washington Post — has chosen another to be his home when he's in town.
In 2016, Bezos paid $23 million for the capital's former Textile Museum and is turning its historic, 27,000-square foot buildings into a residence, The Post reports.
Washingtonian magazine says after a major renovation, the home will have 11 bedrooms, 25 bathrooms, five living rooms and two elevators. Oh, and the museum? It's now located at George Washington University.
15. Books and more books
So it might not seem surprising that Bezos has a passion for books. In his book about Amazon and Bezos, The Everything Store, author Brad Stone writes that Bezos likes to read, and recommends books to his senior managers.
16. Audio books, too
If you're going to be the "earth's biggest bookstore," as Amazon called itself in the early days, that should include audio books, too — right?
That was the obvious thinking in 2008 when Bezos and his company spent $300 million to buy Audible, the world's largest seller of downloadable audiobooks and other spoken-word entertainment.
Audible founder Don Katz told Business Insider in a podcast that the deal felt right and that he knew Amazon and Bezos could help take Audible to the next level. Its catalog now includes more than 350,000 titles.
17. A store full of organic food
Bezos went grocery shopping for organic food — and his company wound up buying out the store.
The business world was shocked in June 2017 when Amazon said it was acquiring the Whole Foods Market chain for $13.7 billion. "They make it fun to eat healthy," Bezos said in the official announcement.
He wasn't always a believer in good nutrition. At one time, his breakfast routine was to eat a whole can of Pillsbury biscuits every morning, according to GeekWire.
18. Shoes galore
In 2009, Bezos decided the giant online shoe store Zappos was a good fit and said, "I'll take it."
Amazon bought Zappos for more than $900 million. At the time, Amazon wasn't considered much of a go-to for clothing and accessories, but that has been changing since the Zappos deal.
Bezos explained in a video statement that he was a longtime fan of the shoe e-tailer. "Zappos has a customer obsession which is so easy for me to admire," he said.
19. An online haven for film fans
One of Jeff Bezos' very first business deals with Amazon was a takeover of IMDb in 1998, when the site was known as Internet Movie Database.
The $55 million sale came just four years after Amazon was launched. In a news release, the company said its goal was "to support its eventual entry into online video sales."
Today, IMDb is the top movie website in the world, drawing 250 million users every month.
20. Pizzas for meetings
Jeff Bezos doesn't like to waste time in unnecessary meetings, so he's said to be a firm believer in what's known as the "two-pizza rule."
It goes like this: Nothing ever gets done in big sprawling meetings, so if two pizzas won't be enough to feed everyone at a meeting, then don't bother scheduling it.
We can't say for sure that Bezos actually buys two pizzas for every meeting he attends — but he could certainly afford to!